SPS Line
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SPS-523 Mechanical Seal (PS-523) — 1-7/8″
SPS-523 Mechanical Seal (PS-523) — 1-7/8″
Item #N/A
Single Spring Mechanical Seal SPS-523 | PS-523 Equivalent
SPS-523 single spring mechanical seal, PS-523 / 523 equivalent. Fits 1-7/8″ shaft with 2.625″× 0.500″ cup seat, and Type N-22 rotary head.
Key specs: Shaft size: 1-7/8″ single spring seal • Seat: 2.625″ x 0.500″ • Rotary OD: 2.520″• Working length: 2.125″
Rotary head type E/1. Utilized in centrifugal pumps, mixers, rotating equipment, and further apparatus.
Interchange / replacements:
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Can replace Type E and Type 1 in many applications (confirm dimensions)
Design & construction:
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Electro-polished 316 stainless steel metal parts
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Elastomeric bellows for stable sealing and easy installation
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Independent of shaft rotation
Material options (select above):
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CAR/CER/NIT — Carbon/Ceramic, Nitrile elastomers
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CAR/CER/VIT — Carbon/Ceramic, Viton elastomers
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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 523C N Line PS-523 Easy installation & broad compatibility SPS-523 SPS Line PS-523 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
SPS-745 Mechanical Seal (PS-745)- 1-5/8″
SPS-745 Mechanical Seal (PS-745)- 1-5/8″
Item #SPS-745
Single Spring Mechanical Seal SPS-745 | PS-745 Equivalent
SPS-745 single spring mechanical seal, PS-745 / 745 equivalent. Fits 1-5/8″ shaft with 2.375″× 0.500″ seat and Type E/1 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″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Material options (select above):
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CAR/CER/NIT — Carbon/Ceramic, Nitrile elastomers
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CAR/CER/VIT — Carbon/Ceramic, Viton elastomers
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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 SPS745 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.
SPS-838 Mechanical Seal (PS-838 Cup) – 2-3/4″
SPS-838 Mechanical Seal (PS-838 Cup) – 2-3/4″
Item #N/A
Single Spring Mechanical Seal SPS-838 | PS-838 cup Equivalent
SPS-838 single spring mechanical seal, PS-838 / 838 cup equivalent. Fits 2-3/4″ shaft with 3.500″×.625″ seat and Type E/1 rotary head
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 2-3/4″ single spring seal • Seat: 3.500″ x .625″ cup • Rotary OD: 3.520″ • Working length: 2.875″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
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CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
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CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
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SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
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Heavier elastomer bellows for improved structural integrity and stability under pressure
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Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
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316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
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Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
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Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
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.
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