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1. Mechanical Seals

  • PS-3793 mechanical pump seal

    Single Spring Mechanical Seal 3793 | PS-3793 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3793 | PS-3793 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3793 | PS-3793 Equivalent (G-Type / 2100)

    Direct-fit aftermarket replacement G-Type mechanical seal equal to industry standard 3793 / PS-3793, built in the John Crane 2100/2106 style for dependable, leak-tight performance. This seal is commonly used in larger pump applications where a 3-1/2″ shaft single spring unitized seal is required.

    Key specs: • Shaft size: 3-1/2″ (3.500″) single spring seal • Seat: 4.375″ x 0.625″ • Rotary OD: 4.402″  • Working length: 2.189″

    Materials & design notes:

    • Material build: Carbon / Silicon Carbide / EPDM

    • Design note: Center-mount O-ring seat (no notch)

    OEM reference:

    • OEM number: P5001895

    • Brand: Bell & Gossett (A Xylem Brand)

    • Common nameplate data: VSX / VSC including 14×16×17 and 12×14×17.5B configurations

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
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  • PS-4490 PS-3804 mechanical seal replacement, buy now

    Single Spring Mechanical Seal 3804 | PS-3804 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3804 | PS-3804 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3804 | PS-3804 Equivalent

    Direct-fit aftermarket G-Type replacement mechanical seal equal to industry standard 3804 / PS-3804, designed in the John Crane 2100 style for dependable, leak-tight pump performance.

    Key specs: • Shaft size: 2-1/2″ (2.500″) single spring seal • Seat: 3.375″ x 0.562″ • Rotary OD: 3.268″ • Working length: 1.811″

    Material build: Carbon/Silicon Carbide/EPDM

    OEM reference (helps match manuals/invoices)

    This seal is commonly cross-referenced to:

    • OEM number: P5001891

    • Brand: Bell & Gossett (A Xylem Brand)

    • Nameplate data: VSX Series – Standard Construction

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • PS-3883 mechanical seal replacement, buy now

    Single Spring Mechanical Seal 3883 | PS-3883 Equivalent (G-Type / 2100 Style)

    Single Spring Mechanical Seal 3883 | PS-3883 Equivalent (G-Type / 2100 Style)

    Single Spring Mechanical Seal 3883 | PS-3883 Equivalent

    Direct-fit aftermarket G-Type mechanical seal equal to industry standard 3883 / PS-3883, designed in the John Crane 2100 / 2106 style for reliable, leak-tight performance. Commonly found in applications referencing Sta-Rite/Pentair OEM numbers and specific pump models (example listing: STA-RITE DHJ3-170MS3).

    Key specs: • Shaft size: : 1-1/4″ (1.250″) single spring seal • Seat: 1.875″ x .0437″ • Rotary OD: 1.811″ • Working length: 1.024″

    OEM cross references shown/commonly used

    • U9-433SS (Sta-Rite / Pentair reference)

    • U109-220

    • U90451SS (Viton material version reference)

    ***Please note: At Seal House, we have seen this seal in pumps where OEM manual states U109-220 or U90451SS. U90451SS is 3883 in viton material. Our standard replacement is 3883, for non chemical applications and temperatures below 220°F . For chemical service or temperatures above 220°F, you need 3883 with viton material, which is equivalent to OEM U90451SS. Please contact us for viton pricing and delivery

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • PS-3992 mechanical seal replacement

    Single Spring Mechanical Seal 3992 | PS-3992 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3992 | PS-3992 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3992 | PS-3992 Equivalent

    Direct-fit aftermarket replacement G-Type mechanical seal equal to industry standard 3992 / PS-3992, built in the John Crane 2100 / 2106 style for reliable, leak-tight performance in common pump services. Designed for use with a 1-1/2″ cup seat and matches configurations commonly used in 2100S 38mm rotary assemblies.

    Key specs: • Shaft size: 1-1/2″ (1.500″) single spring seal • Seat (mating ring): 2.125″ x 0.437″• Rotary OD: 2.125″ • Working length: 1.181″

    Material build: Carbon/Viton (FKM)— Viton elastomers with Carbon rotary face (typical PS-3992/VCFJF listings)

    Compatible components

    • Designed for use with 1-1/2″ cup seat. Matches configurations used in 2100S 38MM rotary assemblies.

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

    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.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • ps-4357 , ps-3170 mechanical seal replacement 2100 type G John Crane 2100 PS-3170 mechanical seal replacement

    Single Spring Mechanical Seal 4357 | PS-4357 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4357 | PS-4357 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4357 | PS-4357 Equivalent

    Direct-fit G-Type replacement equal to industry standard 4357 / PS-4357. Designed to the John Crane 2100 style for reliable, leak-tight performance. Configured with an EPDM/Carbon/Silicon Carbide face combination, ideal for demanding pump applications.

    This seal is supplied with a #129 L-shaped O-ring (75 duro) for proper sleeve fit. Unlike some OEM designs that use an offset/center-mount seat O-ring, this PS-style seal uses a bottom-mount seat O-ring layout for easier installation and direct compatibility.

    Key specs: • Shaft size: 2.000″ single spring seal • Seat: 2.75″ x 0.500″ • Rotary OD: 2.598″ • Working length: 1.500″

    Material build: Carbon/Silicon Carbide/EPDM (Carbon, Silicon Carbide faces, EPDM elastomers) 

    Fitment &Applications:
    Compatible with a variety of pump models including:

    • VSX-VSC 8.125 (4 x 6 x 10.5B RHR, 10 HP)

    • VSX-VSH 10.5 (6 x 8 x 10.5 RHR, 75 HP)

    • VSX-VSC 9.375 (5 x 6 x 10.5B)

    Cross Reference:

    • OEM Part Number: P5001889

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

    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.

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • PS-4490 PS-3804 mechanical seal replacement, buy now

    Single Spring Mechanical Seal 4490 | PS-4490 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4490 | PS-4490 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4490 | PS-4490 Equivalent

    Direct-fit G-Type mechanical seal replacement equal to industry standard 4490 and PS-4490. Built to the John Crane 2100 style for reliable, leak-tight performance in commercial HVAC/hydronic pump service.

    Key specs: • Shaft size: 2-1/2″ (2.500″) single spring seal • Seat: 3.375″ × 0.562″ • Rotary OD: 3.268″ • Working length: 1.811″

    Standard material build: SIC / SIC / VIT — Silicon Carbide vs. Silicon Carbide faces; Viton/FKM elastomers (Many OEM builds use a carbon rotary—this version is upgraded to SiC/SiC for longer life.)

    Fitment / notes

    • VSX 8×6 series; OEM reference: P5001086 , P5001891

    • Sleeve uses #140 O-ring

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • Buy PS-4801

    Single Spring Mechanical Seal 4801 | PS-4801 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4801 | PS-4801 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 4801 | PS-4801 Equivalent

    Direct-fit aftermarket G-Type replacement mechanical seal equal to industry standard 4801 / PS-4801. Built to the 2-1/2″ John Crane 2100 style for reliable, leak-tight pump performance

    Key specs: • Shaft size: 2-1/2″ (2.500″) single spring seal • Seat: 3.375″ × 0.562″ • Rotary OD: 3.268″ • Working length: 1.299″

    Material build: SIC / SIC / VIT — Silicon Carbide vs. Silicon Carbide faces; Viton elastomers
    (Many OEM builds use a carbon rotary—this version is upgraded to SiC/SiC for longer life.)

    Seat style

    • Notched O-ring seat — Hydromatic upper configuration

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • PS-6261 mechanical seal

    Single Spring Mechanical Seal 6261 | PS-6261 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 6261 | PS-6261 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 6261 | PS-6261 Equivalent

    Direct-fit G-Type mechanical seal replacement equal to industry standard 6261 / PS-6261. Designed to the John Crane 2100 style for reliable, leak-tight performance in common pump service applications.

    Key specs: • Shaft size: 1-1/4″ (1.250″) single spring seal • Seat: 1.875″ x 0.437″ • Rotary OD: 1.811″ • Working length: 1.062″

    Material build: BUNA / CAR / CER — Buna-N elastomers; Carbon vs. Ceramic faces

    Compatible components: Often paired with sleeve/adapter components referenced as

    • Sta-Rite DHH-169 sleeve

    • Berkeley 13910 sleeve

    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.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
    View Product
  • 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

    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
    View Product

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