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Single Spring Seal

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

    358c

    358c

    Item #N/A

    Single Spring Mechanical Seal 358C — 3/4″ | PS-358 Equivalent

    Equal to: Industry standard 358 / PS-358

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

    Key specs: Shaft size: 3/4″ single spring seal • Seat: 1.375″ x 0.405″ cup • Rotary OD: 1.197″• Working length: 0.875″

    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

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

    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.

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

    359c

    359c

    Item #N/A

    Single Spring Mechanical Seal 359C — 5/8″

    Equal to:Industry standard 359 / PS-359

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

    Key specs

    5/8″ Single spring mechanical seal with 1.250 x .406″ cup seat , 1.063 rotary OD, .875″ working length

    Design & construction

    • Crimped rotary head — similar to industry Type C / 21

      • Can also replace Type D / 2 heads 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 menu above)

    • CAR/CER/NIC — 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 Pre-Cut Gaskets.

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

    361c / 2122

    361c / 2122

    Item #N/A

    Single Spring Mechanical Seal 361c / 2122 | PS-361 / PS-2122 Equivalent

    Equal to industry standard number 361 / PS-361 as well as PS-2122

    Shaft size: 1-1/4″ single spring mechanical seal with 1.875″ x .437″ cup seat, 1.787″ rotary OD, 1.687″ working length

    Please Note: 361C is a drop-in replacement for U.S. Seal PS-2122 ; Sta-Rite S32013 (and other comparable models), this seal features a smaller-OD rotary for a more universal fit—especially in tight housings and straight-bore/ANSI boxes. The crimped-head design enhances structural integrity and sealing force, delivering higher pressure capability and reliable, long-term performance.

    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

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

    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.

    View Product
  • PS-3793 mechanical pump seal

    3793

    3793

    Single Spring Mechanical Seal 3793 | PS-3793 Equivalent

    Direct-fit G-Type replacement equal to industry standard 3793 / PS-3793. Designed to the John Crane 2100 style for reliable, leak-tight performance.

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

    Material build: Carbon/Silicon Carbide/EPDM

    Design notes: This seal features a center-mount o-ring seat with no notch

    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.

    View Product
  • PS-4490 PS-3804 mechanical seal replacement, buy now

    3804

    3804

    Single Spring Mechanical Seal 3804| PS-3804 Equivalent

    Direct-fit G-Type replacement equal to industry standard 3804 / PS-3804. Designed to the John Crane 2100 style for reliable, leak-tight performance.

    Key specs: • Shaft size: 2-1/2″ single spring seal • Seat: 3.375″ x .562″ • Rotary OD: 3.268″ • Working length: 1.811″

    Material build: Carbon/Silicon Carbide/EPDM

    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.

    View Product
  • buy PS-381 PS-978 Pump Seal

    381C

    381C

    Item #N/A

    Single Spring Mechanical Seal 381C — 1-1/4″ | PS-381 Equivalent

    Equal to: Industry standard 381 / PS-381 ; can also replace PS-804 & PS-246

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

    Key specs: Shaft size: 1-1/4″ single spring seal • Seat: 1.875″ x 0.437″ • 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

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

    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.

    View Product
  • ps-1000 ,ps-961 ps-3865 mechanical seal

    3865

    3865

    Mechanical Seal 3865 — T-6A (5/8″) | PS-3865 Equivalent

    Equal to industry standard 3865 / PS-3865.
    Direct-fit T-6A 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 • 1.25″ × 0.406″ cup seat • Machined carbon/ceramic faces • Viton elastomers

    Why choose 3865 (PS-3865):

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

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

    • Machined carbon face for smoother sealing and stability

    Upgrades / Alternatives (same footprint):

    • 1000  — Basic

    • 961 — Premium carbon face (Buna)

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

    3866

    3866

    Mechanical Seal 3866 — Type 166 / T-16 (5/8″) | PS-3866 Equivalent

    Equal to industry standard 3866 / PS-3866.
    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 • 1.187″ × 0.343″ cup seat • Machined carbon/ceramic faces • Viton® elastomers

    Why choose 3866 (PS-3866):

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

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

    • Machined carbon face for smoother sealing vs. molded carbon

    Upgrades / Alternatives (same footprint):

    • 100 — Basic (Buna)

    • 957 — Premium carbon face (Buna)

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

    3867

    3867

    Mechanical Seal 3867 — Type 166 / T-16 (5/8″) | PS-3867 Equivalent

    Equal to industry standard 3867 / PS-3867.
    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 • 1.25″ × 0.406″ cup seat • Machined carbon/ceramic faces • Viton® elastomers

    Why choose 3867 (PS-3867):

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

    • Machined carbon face for smoother sealing vs. molded carbon

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

    Upgrades / Alternatives (same footprint)

    • 200 — Basic (Buna)

    • 516 — Premium carbon face (Buna)

    • 200cv — Molded carbon

    • 200cvss — 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
    View Product

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