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All Single Spring Seals

  • Type n11, C, 1 Mechanical pump Seal - buy now

    758c Mechanical Seal (PS-758) – 1-1/2″

    758c Mechanical Seal (PS-758) – 1-1/2″

    Item #N/A

    Single Spring Mechanical Seal 758C — 1-1/2″ | PS-758 Equivalent

    758c single spring mechanical seal, PS-758 / 758 equivalent. Fits 1-1/2″ shaft with 2.125″×0.437″ cup seat and Type N-11 (Type C/21) rotary head.

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

    Key specs: Shaft size: 1-1/2″ single spring seal • Seat: 2.125″ x 0.437″ cup • Rotary OD: 2.067″• Working length: 1.125″

    Design & construction:
    Crimped rotary head (Type N-11)—similar to industry Type C / 21; can also replace Type D / 2 with a simple spring change (in most cases). 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 elastomers

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

    Have questions? Check out our Single Spring Seal Guide  or call us anytime—we’re here to help.

    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
  • 7679c Mechanical Seal (PS-7679) - 1-3/4"

    7679c Mechanical Seal (PS-7679) – 1-3/4″

    7679c Mechanical Seal (PS-7679) – 1-3/4″

    7679c Mechanical Seal (PS-7679) – 1-3/4″

    7679c single spring mechanical seal (also called 550CVSS), PS-7679 equivalent. Fits 1-3/4″ shaft with 2.500″×0.500″ seat and Type N-11 (Type C/21) rotary head; SiC/SiC with Viton (FKM).

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

    Key specs
    Shaft size: 1-3/4″ single spring seal • Seat: 2.500″ × 0.500″ cup • Rotary OD: 2.402″ • Working length: 1.375″

    Design & construction
    Crimped rotary head (Type N-11)—similar to industry Type C / 21; can also replace Type D / 2 with a simple spring change (in most cases). Features an O-ring seat with rear relief slots for improved seating/fit. Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Material: SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton elastomers

    Cross reference & alternative part numbers

    PS-7679
    7679c
    550CVSS (also searched as 550cvss / 550-CVSS / 550 CVSS)
    PS-550

    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
  • Type n11, C, 1 Mechanical pump Seal - buy now

    844c Mechanical Seal (PS-844) – 2-1/8″

    844c Mechanical Seal (PS-844) – 2-1/8″

    Item #N/A

    Single Spring Mechanical Seal 844C — 2-1/8″ | PS-844 Equivalent

    844c single spring mechanical seal, PS-844 / 844 equivalent. Fits 2-1/8″ shaft with 3.000″× 0.562″ seat and Type N-11 (Type C/21) rotary head.

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

    Key specs: Shaft size: 2-1/8″ single spring seal • Seat: 3.000″ x 0.562″ cup • Rotary OD: 2.776″ • Working length: 1.687″

    Design & construction:
    Crimped rotary head (Type N-11)—similar to industry Type C / 21; can also replace Type D / 2 with a simple spring change (in most cases). 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 elastomers

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

    Have questions? Check out our Single Spring Seal Guide  or call us anytime—we’re here to help.

    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-100 , ps-200 , ps-201 mechanical seal- buy now!

    851 Mechanical Seal (PS-851) —3/4″

    851 Mechanical Seal (PS-851) —3/4″

    Mechanical Seal 851 — Type 166 / T-16 (3/4″) | PS-851 Equivalent

    Equal to industry standard 851 / PS-851.
    Direct-fit Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—built with a machined carbon/ceramic face set and Buna-N elastomers for reliable everyday service.

    At-a-glance specs: 3/4″ shaft • 1.375″ × 0.406″ cup seat • Machined carbon/ceramic faces • Buna-N elastomers

    Why choose 851 (PS-851):

    • T-16 footprint for quick, drop-in replacement

    • Machined carbon face for smoother sealing vs. molded carbon

    • Dependable materials for standard pool/spa chemistry

    Upgrades / Variations (same footprint)

    • 201c — Basic (Buna)

    • 3868 — Premium + Viton

    • 201cv  — Molded carbon

    •  201cvss— Silicon Carbide / Silicon Carbide / Viton

    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 Pre-Cut Gaskets.

    Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • ps-100 , ps-200 , ps-201 mechanical seal- buy now!

    957 Mechanical Seal (PS-957) — 5/8″

    957 Mechanical Seal (PS-957) — 5/8″

    Mechanical Seal 957 — Type 166 / T-16 (5/8″) | PS-957 Equivalent

    Equal to industry standard 957 / PS-957.
    Direct-fit Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—built with a machined carbon/ceramic face set and Buna-N elastomers for reliable everyday service.

    At-a-glance specs: 5/8″ shaft • 1.187″ × 0.343″ cup seat • Machined carbon/ceramic faces • Buna-N elastomers

    Why choose 957 (PS-957):

    • T-16 footprint for fast, drop-in replacement

    • Machined carbon face for smoother sealing vs. molded carbon

    • Dependable materials for standard pool/spa chemistry

    Upgrades / Variations (same footprint):

    • 100c  — Basic

    • 3866 — Premium + Viton

    • 100cv — Molded carbon

    • 100cvss  — Silicon Carbide / Silicon Carbide / Viton

    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 Pre-Cut Gaskets.

    Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • ps-1000 ,ps-961 ps-3865 mechanical seal

    961 Mechanical Seal (PS-961) — 5/8″

    961 Mechanical Seal (PS-961) — 5/8″

    Mechanical Seal 961 — T-6A (5/8″) | PS-961 Equivalent

    Equal to industry standard 961 / PS-961.
    Direct-fit T-6A single-spring seal for pool/spa and small-pump applications—built with a machined carbon face for smoother sealing and longer life in everyday service.

    At-a-glance: 5/8″ shaft • 1.25″ × 0.406″ cup seat • Machined carbon/ceramic faces • Buna-N elastomers

    Why choose 961 (PS-961)

    • T-6A footprint for quick, drop-in replacement

    • Machined carbon vs. molded carbon for improved surface finish and stability

    • Dependable Buna-N for standard pool/spa chemistry

    Upgrades / Variations (same footprint)

    • 1000 — Basic

    • 3865 — Premium + Viton

    • 1000cv— Molded carbon

    • 1000cvss — Silicon Carbide / Silicon Carbide / Viton

    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 Pre-Cut Gaskets.

    Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help

    Please click “specifications for OEM numbers and Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • buy PS-381 PS-978 Pump Seal

    978c Mechanical Seal (PS-978) – 1-1/4″

    978c Mechanical Seal (PS-978) – 1-1/4″

    Item #N/A

    Single Spring Mechanical Seal 978C — 1-1/4″ | PS-978 Equivalent

    978c single spring mechanical seal, PS-978 / 978 equivalent. Fits 1-1/4″ shaft with 1.765″×.365″ seat and Type N-33 (tapered spring) rotary head.

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

    Key specs: Shaft size: 1-1/4″ single spring seal • Seat: 1.765″ x 0.365″ • Rotary OD: 1.787″ • Working length: 1.062″

    Design & construction:
    Crimped rotary head (Type N-33)—equivalent to Pac-Seal T-21 (tapered spring) and Burgmann MG9, can replace seal type D & 2 type seal heads. Tapered spring for wide base to fit over impeller hub or other similar feature. 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 elastomers

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

    Have questions? Check out our Single Spring Seal Guide  or call us anytime—we’re here to help.

    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
  • MG1 G4 mechanical seal 25mm

    MG1 G4 Mechanical Seal – 25mm

    MG1 G4 Mechanical Seal – 25mm

    MG1 G4 Mechanical Seal (T-19) – 25mm

    Direct-fit aftermarket MG1 G4 25mm mechanical seal replacement seal built for demanding pump applications where extended wear life and chemical resistance matter. This version uses a Viton elastomer with Silicon Carbide / Silicon Carbide (SiC/SiC) sealing faces, making it an excellent choice for tough water conditions, higher heat, and abrasive service compared to standard carbon/ceramic combinations.

    Specifications

    • Seal Style: MG1 G4

    • Shaft Size: 25mm

    • Seat Size: 38mm × 7.5mm

    • Elastomer: Viton (FKM)

    • Face Materials: Silicon Carbide / Silicon Carbide

    • Cross Reference: T-19, HD-8038, STG4VSC25

    Cross references & alternative part numbers 
    This seal is also commonly referenced as:

    • T-19 25mm mechanical seal

    • HD-8038 seal

    • STG4VSC25 seal

    • MG1 25mm Viton SiC/SiC seal

    • 25mm mechanical seal with 38 × 7.5mm seat

    Need help confirming fit?
    If you’re matching a seal by size, confirm the shaft size (25mm) and the seat (38 × 7.5mm) before ordering. If you want, send us the pump model and a photo of the old seal/seat for verification.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • 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