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Single Spring Seal

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

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

    Mechanical Seal 851 (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
    View Product
  • ps-100 , ps-200 , ps-201 mechanical seal- buy now!

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

    Mechanical Seal 957 (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
    View Product
  • ps-1000 ,ps-961 ps-3865 mechanical seal

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

    Mechanical Seal 961 (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
    View Product
  • 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
    View Product
  • PS-3015 mechanical seal pump buy now

    Single Spring Mechanical Seal 3015 | PS-3015 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3015 | PS-3015 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3015 | PS-3015 Equivalent (G-Type / 2100)

    Direct-fit aftermarket 3015 / PS-3015 mechanical pump seal built in the G-Type / John Crane 2100 style—a compact, unitized, single-spring elastomer bellows seal design widely used across pump applications. Ideal for repairs where you need OEM-style fit and reliable sealing performance.

    Key specs: • Shaft size: 1-3/8″ (1.375″) single spring seal • Seat: 2.000″ x 0.437″ • Rotary OD: 1.929″ • Working length: 1.024″

    Material build: VIT / SIC / SIC — Viton elastomers; Silicon Carbide vs. Silicon Carbide faces
    Excellent chemical/temperature resistance and wear durability.

    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-3020 mechanical seal pump, buy now

    Single Spring Mechanical Seal 3020 | PS-3020 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3020 | PS-3020 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3020 | PS-3020 Equivalent (G-Type / 2100)

    Direct-fit aftermarket 3020 / PS-3020 mechanical pump seal built in the G-Type / John Crane 2100 style for reliable, leak-tight performance. This is a common single-spring seal used across industrial and HVAC/hydronic pump applications—match dimensions and OEM references before ordering.

    Key specs: • Shaft size: 2-1/8″ (2.125″) single spring seal • Seat: 3.000″ x 0.562″ • Rotary OD: 2.717″ • Working length: 1.181″

    Material build (standard)

    • VIT / SIC / SIC — Viton elastomers; Silicon Carbide vs. Silicon Carbide faces
      Excellent chemical/temperature resistance and wear durability.

    Fitment

    • O-ring seat design

    • Listed as compatible with VSC-style pump 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
  • 3021 / 3802 mechanical seal replacement

    Single Spring Mechanical Seal 3021 / 3802 | PS-3021 ; PS-3802 Equivalent 

    Single Spring Mechanical Seal 3021 / 3802 | PS-3021 ; PS-3802 Equivalent 

    Single Spring Mechanical Seal 3021 / 3802 | PS-3021 PS-3802 Equivalent

    Direct-fit aftermarket replacement G-Type mechanical seal equal to industry standard 3021 / 3802 and PS-3021 / PS-3802. Built to the John Crane 2100-style design for reliable, leak-tight performance in demanding pump service.

    Key specs: • Shaft size: 3.000″ single spring seal • Seat: 3.875″ × 0.625″ • Rotary OD: 3.898″ • Working length: 2.062″

    Material build

    • VIT / SIC / SIC — Viton elastomers; Silicon Carbide vs. Silicon Carbide faces
      Excellent chemical/temperature resistance and wear durability.

    Cross-references

    • 3021 / 3802, PS-3021 / PS-3802

    • Industry standard G-Type / John Crane 2100

    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 Pre-Cut Gaskets.

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

    Single Spring Mechanical Seal 3022 | PS-3022 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3022 | PS-3022 Equivalent (G-Type / 2100)

    Single Spring Mechanical Seal 3022 | PS-3022 Equivalent (G-Type / 2100)

    Direct-fit aftermarket G-Type mechanical seal equal to industry standard 3022 / PS-3022. Designed in the John Crane 2100-style configuration for reliable, leak-tight performance in common pump services.

    Key specs: • Shaft size: 2-3/8″ (2.375″) single spring seal • Seat: 3.250″ x 0.562″ • Rotary OD: 3.150 • Working length: 1.299″

    OEM reference

    • OEM number: 81974941

    • Brand: Flowserve Corporation

    • Nameplate data: VCS Mechanical Seal

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

    Single Spring Mechanical Seal 3170 | PS-3170 Equivalent

    Single Spring Mechanical Seal 3170 | PS-3170 Equivalent

    Single Spring Mechanical Seal 3170 | PS-3170 Equivalent (G-Type / 2100)

    Direct-fit aftermarket replacement mechanical seal 3170 / PS-3170 built in the G-Type / John Crane 2100 & 2106 style for reliable, leak-tight performance. This seal is a common solution for 2.000″ shaft pump repairs where a floating mating ring (Type G) configuration is required.

    Key specs: • Shaft size: 2.000″ single spring seal • Seat: 2.750″ x 0.500″ • Rotary OD: 2.598″ • Working length: 1.500″

    Material build (standard):

    • VIT / SIC / SIC — Viton (FKM) elastomers; Silicon Carbide vs. Silicon Carbide faces
      Excellent chemical/temperature resistance and wear durability.

    Key Features:

    • Upgraded design: Replaces the original carbon rotary face with a silicon carbide rotary face for enhanced durability and abrasion resistance.

    • Includes Viton #129 O-ring for sleeve

    • Seal type: T-25 L-shape floating seal

    Cross Reference:

    • OEM Number: P5001890

    • Brand: Bell & Gossett (a Xylem brand)

    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

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