G-Type / 2100
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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)
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VSX-VSH 10.5 (6 x 8 x 10.5 RHR, 75 HP)
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VSX-VSC 9.375 (5 x 6 x 10.5B)
Cross Reference:
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OEM Part Number: P5001889
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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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
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VSX 8×6 series; OEM reference: P5001086 , P5001891
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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
4801 Mechanical Seal (PS-4801)— 2-1/2″
4801 Mechanical Seal (PS-4801)— 2-1/2″
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
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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
6261 Mechanical Seal (PS-6261)— 1-1/4″
6261 Mechanical Seal (PS-6261)— 1-1/4″
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
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Sta-Rite DHH-169 sleeve
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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
Taco 70mm Mechanical Seal (2100K) – 70mm
Taco 70mm Mechanical Seal (2100K) – 70mm
Taco 70 mm Mechanical Seal — 2100K
Taco 70mm mechanical seal replacement (2100K style) for Taco centrifugal/hydronic pumps. Built with SiC/SiC faces and Viton (FKM) elastomers for temperature and chemical resistance. This is a 70 mm mechanical seal built to the 2100K style, commonly used in HVAC and hydronic circulation service (hot/chilled water systems) where durability and temperature resistance are important.
Material build
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Faces: SiC / SiC
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Elastomers: Viton
Cross-references
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Taco: 955-1846RP, 955-1841RP (SiC/Viton material code)
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Other refs: TS100801/70/G, TC100813
Best for
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HVAC systems, hot/chilled water circulation, and general hydronic service where durability and temperature resistance are critical.
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.
Have questions? Call us anytime- we’re here to help
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