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1. Mechanical Seals

  • 4240c mechanical seal is a direct-fit 5/ seal, the PS-4240 equivalent, cross-referenced to Goulds 10K10. ps-680c

    680c / 702c Mechanical Seal (PS-680 / PS-702) — 5/8″

    680c / 702c Mechanical Seal (PS-680 / PS-702) — 5/8″

    Item #N/A

    680c / 702c Mechanical Seal (PS-680 / PS-702) — 5/8″

    The 680c / 702c mechanical seal is a direct-fit 5/8″ shaft seal, the PS-680 and PS-702 equivalent. It is built to OEM-equivalent standards or higher with a Type 166 footprint and a quality molded carbon face for dependable pool, spa, and small-pump service. Available in multiple material builds — see the options below.

    Molded Carbon Face 
    This 680c / 702c uses a quality molded carbon face — a dependable build for pool, spa, and small-pump service, with smooth sealing and reliable life. For the premium machined carbon version, see our 4240c / Goulds 10K10 seal.

    Drop-in equivalent for common Type 16, G, A, 6, AV, 2100 styles.
    Built for pool/spa and small-pump service with a precision finish and OEM-friendly dimensions.

    At-a-glance specs: 5/8″ shaft • 1.187″ × 0.288″ cup seat (verify seat thickness) • Type 166 footprint

    Cross Reference: Replaces PS-702, PS-4462, PS-518, PS-701, PS-4284.

    Material options (select from dropdown)

    • CAR/CER/NIT — Standard build with machined carbon vs. ceramic, Nitrile elastomers.

    • CAR/CER/VIT — Same machined carbon/ceramic with Viton for higher chlorine, temperature, and chemicals.

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide with Viton for maximum wear and heat resistance.

    • CAR/SIC/VIT — Direct replacement choice for PS-4284.

    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 .25 lbs
    Dimensions 1.5 × 1.5 × 1.25 in
  • N22 PS replacement mechanical seal

    745c Mechanical Seal (PS-745)- 1-5/8″

    745c Mechanical Seal (PS-745)- 1-5/8″

    Item #N/A

    Single Spring Mechanical Seal 745c | PS-745 Equivalent

    745c single spring mechanical seal, PS-745 / 745 equivalent. Fits 1-5/8″ shaft with 2.375″× 0.500″ seat and Type N-22 rotary head.

    Key specs: Shaft size: 1-5/8″ single spring seal • Seat: 2.375″ x 0.500″ cup • Rotary OD: 2.185″ • Working length: 2.000″

    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

    Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide
    Seal Model Product Line Replaces Features & Focus
    745C N Line PS-745 Easy installation & broad compatibility
    SPS-745 SPS Line PS-745 Premium build for longevity & like for like replacement.

    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 .9 lbs
    Dimensions 2.5 × 2.5 × 2.5 in
  • N22 PS replacement mechanical seal

    754c Mechanical Seal (PS-754) – 1″

    754c Mechanical Seal (PS-754) – 1″

    Item #N/A

    Single Spring Mechanical Seal 754c | PS-754 Equivalent

    754c single spring mechanical seal, PS-754 / 754 equivalent. Fits 1″ shaft with 1.625″× 0.437″ cup seat and Type N-22 rotary head.

    Key specs: Shaft size: 1.000″ single spring seal • Seat: 1.625″ x 0.437″ cup • Rotary OD:  1.547″• Working length: 1.625″

    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 .35 lbs
    Dimensions 2 × 2 × 2 in
  • PS replacement mechanical seal

    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 .9 lbs
    Dimensions 2.25 × 2.25 × 1.75 in
  • Ps-7679 mechanical seal

    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″ • 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 .9 lbs
    Dimensions 2.75 × 2.75 × 2 in
  • PS replacement mechanical seal

    800c Mechanical Seal (PS-800) – 5/8″

    800c Mechanical Seal (PS-800) – 5/8″

    Item #N/A

    Single Spring Mechanical Seal 800C — 5/8″| PS-800 Equivalent

    800c single spring mechanical seal, PS-800 / 800 equivalent. Fits 5/8″ shaft with 1.156″ x 0.312″ seat and Type N-11 (Type C/21) rotary head.

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

    Key specs: Shaft size: 5/8″ single spring seal • Seat: 1.156″ x 0.312″ cup • Rotary OD: 1.063″ • Working length: 1.187″

    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/FKM elastomers

    • SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM 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 .35 lbs
    Dimensions 1.5 × 1.5 × 1.75 in
  • PS replacement mechanical seal

    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 .9 lbs
    Dimensions 3.25 × 3.25 × 2.25 in
  • ps-100 , ps-200 , ps-201 mechanical seal

    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 .25 lbs
    Dimensions 1.5 × 1.5 × 1.25 in
  • Placeholder

    877c Mechanical Seal (PS-877) – 3/4″

    877c Mechanical Seal (PS-877) – 3/4″

    Item #877c

    Single Spring Mechanical Seal 877C — 3/4″ | PS-877 Equivalent

    877C single spring mechanical seal, PS-877 / 877 equivalent. Fits 3/4″ shaft with a crimped Type N-11 rotary head.

    Typical applications: Centrifugal pumps, jet and submersible pumps, and other rotating equipment.

    Key specs: Shaft size: 3/4″ single spring seal • Seat: 1.375″ × 0.406″ cup • OD: 1.187″ • working length: 0.718″ • Rotary head: Type N-11 (C/21)

    OEM numbers and pump nameplate data:

    Franklin Electric Company, Inc. — OEM10120301, 10123010001, 106196102
    Fairbanks Nijhuis — OEM 8273860
    Jacuzzi (Hyde) — Nameplate: 8M, OEM 10-1203-01, 10-1203-19
    Leland Faraday Pump — Nameplate: LFP-533-1100, 5050, 5075, 5100
    Teel Pump — Nameplate: optional for 1P700-1P702, 1P799, 1P803-1P947, 1P949, 2P391, 2P392, 2P393, 2P394; OEM 5P389, 1R308

    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

    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 .25 lbs
    Dimensions 2 × 2 × 1.5 in