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1. Mechanical Seals

  • SMSC 1SV ANSI cartridge mechanical seal 1 to 2-7/8 inch SMSC 1SV Large ANSI cartridge mechanical seal 3 to 4 inch – stationary multi-spring SiC/SiC FKM

    SMSC 1SV — Single Cartridge Mechanical Seal (ANSI)

    SMSC 1SV — Single Cartridge Mechanical Seal (ANSI)

    Item #N/A

    SMSC 1SV — Single Cartridge Mechanical Seal (ANSI)

    Our SMSC 1SV cartridge mechanical seal is a single cartridge seal built on an ANSI footprint, assembled in-house using high-quality components sourced domestically and internationally. It’s designed to deliver reliable performance and strong value across demanding industrial services, while staying easy to maintain and simple to stock.

    Choose size from dropdown menu above: 1″ to 2-7/8″

    At a glance:

    • Style: Single cartridge, stationary design (excellent for high-speed applications)

    • Sizes: 1″ to 2-7/8″ (ANSI) (For larger sizes, see our SMSC 1SV Large 3″–4″)

    • Flush: 1 × 3/8″ NPT flush port standard for enhanced cooling and longer seal life

    • Axial length: Short inboard length to simplify installation and reduce overhang

    • Standard materials: Silicon carbide / silicon carbide (SiC/SiC) faces, FKM, 304 stainless steel

    Check out Seal House Cartridge Seal Installation Guide for installation guidance. 

    Why it lasts:

    • Monolithic seal faces maximize face stability in higher pressure / higher temperature duty to extend service life

    • Large-area seal-face drive helps minimize face damage in stop/start and viscous services

    • Slotted anti-rotation gland with a wider rounded slot improves durability under frequent cycling

    • Hydraulically balanced faces reduce heat generation and power consumption

    • Non-shaft-fretting sleeve elastomer plus positive set-screw drive protect the shaft and ensure secure torque transmission

    • Multiple springs provide even face loading with maximum axial movement compensation

    Need help sizing or selecting materials? Contact us with your pump model and service details—we’ll spec the best 1SV build for your duty.

    Explore our full line up of Shaft Seals
    Looking for more? Shop Pump Repair Kits, Gaskets, OEM Seals & more 
    Weight 4 lbs
    Dimensions 12 × 10 × 6 in
    Model NO.

    SMSC 1SV __
    Standard

    ANSI, 1”-2-7/8”
    Style

    Single cartridge mechanical seal, Multi spring with flush
    Material

    Silicon carbide/Silicon carbide, FKM, 304 stainless steal
  • SMSC 1SV ANSI cartridge mechanical seal 1 to 2-7/8 inch SMSC 1SV Large ANSI cartridge mechanical seal 3 to 4 inch – stationary multi-spring SiC/SiC FKM

    SMSC 1SV — Single Cartridge Mechanical Seal (Large 3″–4″)

    SMSC 1SV — Single Cartridge Mechanical Seal (Large 3″–4″)

    Item #N/A

    SMSC 1SV — Single Cartridge Mechanical Seal (Large 3″–4″)

    The SMSC 1SV Large cartridge mechanical seal is our ANSI-style single cartridge seal for big-bore pump services from 3″ to 4″. It’s a stationary, multi-spring cartridge mechanical seal with a standard 3/8″ NPT flush port, built to deliver reliable performance in higher pressure / higher temperature applications and tough industrial duty cycles.

    Choose size from dropdown menu above: 3″- 4″

    At a glance

    • Style: Single cartridge mechanical seal, stationary design (excellent for high speed)

    • Sizes available: 3″, 3-1/4″, 3-1/2″, 3-3/4″, 4″

    • Flush: 1 × 3/8″ NPT flush port standard (improves cooling and extends seal life)

    • Materials: Silicon carbide / silicon carbide (SiC/SiC) faces, FKM, 304 stainless steel

    • Balance/Drive: Hydraulically balanced faces, positive set-screw drive, non-shaft-fretting sleeve elastomer

    Check out Seal House Cartridge Seal Installation Guide for installation guidance. 

    Why it lasts

    • Monolithic seal faces increase face stability in high-pressure/high-temperature duty

    • Large-area face drive helps reduce face damage in stop/start and viscous services

    • Slotted anti-rotation gland improves durability under frequent cycling

    • Multiple springs provide uniform face loading and strong axial movement compensation

    Typical uses

    Large-frame ANSI pumps in chemical processing, power, pulp & paper, water/wastewater, mining, and general industrial services—especially where higher pressure/temperature, viscosity, or frequent starts/stops are expected.

    Need help selecting the correct size or confirming fit? Contact us with your pump model and service details and we’ll help spec the best 1SV Large build for your application.

    Need help sizing or selecting materials? Contact us with your pump model and service details—we’ll spec the best 1SV Large build for your duty.

    Explore our full line up of Shaft Seals
    Looking for more? Shop Pump Repair Kits, Gaskets, OEM Seals & more
    Weight 4 lbs
    Dimensions 12 × 10 × 6 in
    Model NO.

    SMSC 1SV __
    Style

    Single cartridge mechanical seal, Multi spring with flush
    Material

    Silicon carbide/Silicon carbide, FKM, 304 stainless steal
  • PS-205 mechanical seal PS-278 pump seal PS-279

    SPS-205 Mechanical Seal (PS-205 Equivalent) – 1-3/4″

    SPS-205 Mechanical Seal (PS-205 Equivalent) – 1-3/4″

    Item #N/A

    Single Spring Mechanical Seal SPS-205 | PS-205 Equivalent

    SPS-205 single spring mechanical seal, equivalent to industry standard PS-205 / 205. Fits 1-3/4″ shaft with 2.500″×0.500″ seat and Type E/1 rotary head.

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 1-3/4″ single spring seal • Seat: 2.500″ x 0.500″ • Rotary OD: 2.402″ • Working length: 2.000″

    Design & construction:
    Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    • CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers

    Please click “specifications” below for OEM numbers and Pump Nameplate Data

    Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide

    Seal Model Product Line Replaces Features & Focus
    205C N Line PS-514 Easy installation & broad compatibility
    SPS-205 SPS Line PS-514 Premium build for longevity & like for like replacement.

     

    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-205 mechanical seal PS-278 pump seal PS-279

    SPS-278 Mechanical Seal (PS-278 Cup) – 2-3/8″

    SPS-278 Mechanical Seal (PS-278 Cup) – 2-3/8″

    Item #N/A

    Single Spring Mechanical Seal SPS-278 | PS-278 cup Equivalent

    SPS-278 is a single spring mechanical seal equal to industry standard 278 / PS-278 cup.

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 2-3/8″ single spring seal • Seat: 3.250″ x .562″ cup • Rotary OD: 3.083″ • Working length: 2.500″

    Design & construction:
    Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    • CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-205 mechanical seal PS-278 pump seal PS-279

    SPS-279 Mechanical Seal (PS-279 Cup) – 2-1/2″

    SPS-279 Mechanical Seal (PS-279 Cup) – 2-1/2″

    Item #N/A

    Single Spring Mechanical Seal SPS-279 | PS-279 cup Equivalent

    SPS-279 is a single spring mechanical seal equal to industry standard 279 / PS-279 cup

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 2-1/2″ single spring seal • Seat: 3.375″ x .562″ cup • Rotary OD: 3.210″ • Working length: 2.500″

    Design & construction:
    Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    • CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-3025 PS-514

    SPS-3025 Mechanical Seal (PS-3025) – 1-5/8″

    SPS-3025 Mechanical Seal (PS-3025) – 1-5/8″

    Single Spring Mechanical Seal SPS-3025 | PS-3025 Equivalent

    SPS-3025 single spring mechanical seal, PS-3025 / 3025 equivalent. Fits 1-5/8″ shaft with 2.375″×0.500″ seat and Type D/2 rotary head

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 1-5/8″ single spring seal • Seat: 2.375″ x 0.500″ • Rotary OD: 2.636″ • Working length: 1.375″

    Design & construction:
    Rotary head Type D/2. Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Material: CAR/SIC/EPDM — Carbon vs. Silicon Carbide, EPDM elastomers

    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • SPS-323 Mechanical Seal (PS-323) – 2-1/4"

    SPS-323 Mechanical Seal (PS-323) – 2-1/4″

    SPS-323 Mechanical Seal (PS-323) – 2-1/4″

    Single Spring Mechanical Seal SPS-323 | PS-323 Equivalent

    323c single spring mechanical seal, PS-323 / 323 equivalent. Fits 2-1/4″ shaft with 3.125″× 0.562″ seat and rotary head Type E/1

    Shaft size: 2-1/4″ • Seat: 3.125″ × 0.562″ cup • Rotary OD: 3.150″ • Working length: 2.375″

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Design & construction:
    Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation)

    Materials available

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide

    Seal Model Product Line Replaces Features & Focus
    323C N Line PS-514 Easy installation & broad compatibility
    SPS-323 SPS Line PS-514 Premium build for longevity & like for like replacement.

     

    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-205 mechanical seal PS-278 pump seal PS-279

    SPS-324 Mechanical Seal (PS-324 Cup) – 3″

    SPS-324 Mechanical Seal (PS-324 Cup) – 3″

    Item #N/A

    Single Spring Mechanical Seal SPS-324 | PS-324 cup Equivalent

    SPS-324 single spring mechanical seal, PS-324 / 324 cup equivalent. Fits 3″ shaft with 3.875″×.625″ seat and Type E/1 rotary head.

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 3″ single spring seal • Seat: 3.875″ x .625″ cup • Rotary OD: 3.770″ • Working length: 2.875″

    Design & construction:
    Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    • CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-3025 PS-514

    SPS-514 Mechanical Seal (PS-514) – 1-5/8″

    SPS-514 Mechanical Seal (PS-514) – 1-5/8″

    Item #N/A

    Single Spring Mechanical Seal SPS-514 | PS-514 Equivalent

    SPS-514 single spring mechanical seal, PS-514 / 514 equivalent. Fits 1-5/8″ shaft with 2.37″×0.500″ seat and Type D/2 rotary head.

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 1-5/8″ single spring seal • Seat: 2.37″ x 0.500″ • Rotary OD: 2.185″ • Working length: 1.375″

    Design & construction:
    Rotary head Type D/2. Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers

    • CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers

    • SIC/SIC/EPR — Silicon Carbide vs. Silicon Carbide faces, EPR elastomers

    Please click “specifications” below for OEM numbers and Pump Nameplate Data

    Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide

    Seal Model Product Line Replaces Features & Focus
    514C N Line PS-514 Easy installation & broad compatibility
    SPS-514 SPS Line PS-514 Premium build for longevity & like for like replacement.

     

    SPS Line

    Same Fit. Lasting Reliability.

    Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.

    What sets SPS apart:

    • Heavier elastomer bellows for improved structural integrity and stability under pressure

    • Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability

    • 316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles

    • Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance

    • Built to exacting standards for dependable performance across a wide range of pump applications

    Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.

    Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

    Looking for more? Shop Pump Repair Kits, Parts & Accessories, and  Gaskets.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in