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Single Spring Seal

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

    3868 Mechanical Seal (PS-3868) —3/4″

    3868 Mechanical Seal (PS-3868) —3/4″

    Mechanical Seal 3868 — Type 166 / T-16 (3/4″) | PS-3868 Equivalent

    Equal to industry standard 3868 / PS-3868.

    Direct-fit Type 166 / T-16 single spring seal for pool/spa and small pump applications- upgraded with Viton (FKM) elastomers and a machined carbon/ceramic face set for longer service life.

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

    Why choose 3868 (PS-3868):

    • Viton handles higher chlorine, heat, and chemicals better than Buna

    • Machined carbon face for smoother sealing vs. molded carbon

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

    Upgrades / Alternatives (same footprint)

    • 201c — Basic (Buna)

    •  851 — Premium carbon face (Buna)

    • 201cv — Molded carbon (Viton)

    •  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-3883 mechanical seal replacement, buy now

    3883 Mechanical Seal (PS-3883)— 1-1/4″

    3883 Mechanical Seal (PS-3883)— 1-1/4″

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

    3890C Mechanical Seal (PS-3890) — 5/8″

    3890C Mechanical Seal (PS-3890) — 5/8″

    Mechanical Seal 3890 — Type 166 / T-16 | PS-3890 Equivalent

    Equal to industry standard 3890 / PS-3890 / 200CSP.
    Direct-fit crimped Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—built for reliable everyday service.

    At-a-glance specs:
    5/8″ shaft • Cup seat: 1.381″ / 1.375″ × 0.406″ • Carbon/Ceramic faces • Nitrile elastomers

    Why choose 3890:

    • T-16 footprint for quick, direct replacement

    • General-duty build for clean water and standard chemistry

    • Proven performance in pool/spa and small circulation pumps

    Upgrade / Variation

    • 3890cv — same fit with machined carbon face for enhanced durability

    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!

    3890CV Mechanical Seal (PS-3890V-CMS) — 5/8″

    3890CV Mechanical Seal (PS-3890V-CMS) — 5/8″

    Mechanical Seal 3890V — Type 166 / T-16 (5/8″) | PS-3890V-CMS Equivalent

    Equal to industry standard 3890V / PS-3890V-CMS
    Direct-fit Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—upgraded with Viton elastomers and a machined carbon/ceramic face set for longer service life.

    At-a-glance specs: 5/8″ shaft • 1.381″ / 1.375″ × 0.406″ cup seat • Machined carbon/ceramic faces • Viton elastomers

    Why choose 3890V:

    • Viton handles higher chlorine, heat, and chemicals better than Buna

    • Machined carbon face for smoother sealing and stability

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

    Variation (same footprint)

    • 3890c — Carbon/Ceramic face set

    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

    Weight 1 lbs
    Dimensions 8 × 6 × 4 in
  • PS-3992 mechanical seal replacement

    3992 Mechanical Seal (PS-3992)— 1-1/2″

    3992 Mechanical Seal (PS-3992)— 1-1/2″

    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
  • ps-4357 , ps-3170 mechanical seal replacement 2100 type G John Crane 2100 PS-3170 mechanical seal replacement

    4357 Mechanical Seal (PS-4357)— 2″

    4357 Mechanical Seal (PS-4357)— 2″

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

    446c Mechanical Seal (PS-446) – 1-3/4″

    446c Mechanical Seal (PS-446) – 1-3/4″

    Item #N/A

    Single Spring Mechanical Seal 446C — 1-3/4″ | PS-446 Equivalent

    446c single spring mechanical seal, PS-446 / 446 equivalent. Fits 1-3/4″ shaft with 2.500″× 0.500″ seat and Type N-11 (Type C/21) 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″ 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). 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-4490 PS-3804 mechanical seal replacement, buy now

    4490 Mechanical Seal (PS-4490)— 2-1/2″

    4490 Mechanical Seal (PS-4490)— 2-1/2″

    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
  • N22 pump seal ps-2016, ps-4518 ps-188 ps-754 ps-204 ps-361 ps-354 ps-305 ps-745 ps-205 ps-523 ps-479 ps-537 ps-323

    4518c Mechanical Seal (PS-4518)- 3/4″

    4518c Mechanical Seal (PS-4518)- 3/4″

    Item #N/A

    Single Spring Mechanical Seal 4518c | PS-4518 Equivalent

    4518c single spring mechanical seal, PS-4518 / 4518 equivalent. Fits 3/4″ shaft with 1.375″× 0.405″ cup seat, 1.197″ rotary OD, 1.375″ working length, and Type N-22 rotary head.

    Shaft size: 3/4″ • Seat: 1.375″ × 0.405″ cup • Rotary OD: 1.197″ • Working length: 1.375″

    Crimped rotary head type N-22. Utilized in centrifugal pumps, mixers, rotating equipment, and further apparatus.

    Interchange / replacements:

    • Equivalent to Pac-Seal T-21 (long working length) and Burgmann MG9

    • Can replace Type E and Type 1 in many applications (confirm dimensions)

    Design & construction:

    • Electro-polished 304 stainless steel metal parts

    • Elastomeric bellows for stable sealing and easy installation

    • Independent of shaft rotation

    Material options (select above):

    • CAR/CER/NIT — Carbon/Ceramic, Nitrile elastomers

    • CAR/CER/VIT — Carbon/Ceramic, Viton elastomers

    • SIC/SIC/VIT — Silicon Carbide/Silicon Carbide, 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