Pool/Small Pump Seals
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Mechanical Seal 516 (PS-516) — 5/8″
Mechanical Seal 516 (PS-516) — 5/8″
View ProductMechanical Seal 516 — Type 166 / T-16 (5/8″) | PS-516 Equivalent
Equal to industry standard 516 / PS-516.
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 dependable everyday service.At-a-glance specs: 5/8″ shaft • 1.25″ × 0.406″ cup seat • Machined carbon/ceramic faces • Buna-N elastomers
Why choose 516 (PS-516):
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T-16 footprint for quick, drop-in replacement
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Machined carbon face for smoother sealing vs. molded carbon
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Reliable materials for standard pool/spa chemistry
Upgrades / Variations (same footprint)
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200 — Basic (Buna)
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3867 — Premium + Viton
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200cv — Molded carbon
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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
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Mechanical Seal 851 (PS-851) —3/4″
Mechanical Seal 851 (PS-851) —3/4″
View ProductMechanical 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):
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T-16 footprint for quick, drop-in replacement
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Machined carbon face for smoother sealing vs. molded carbon
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Dependable materials for standard pool/spa chemistry
Upgrades / Variations (same footprint)
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201c — Basic (Buna)
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3868 — Premium + Viton
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201cv — Molded carbon
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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
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Mechanical Seal 957 (PS-957) — 5/8″
Mechanical Seal 957 (PS-957) — 5/8″
View ProductMechanical 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):
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T-16 footprint for fast, drop-in replacement
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Machined carbon face for smoother sealing vs. molded carbon
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Dependable materials for standard pool/spa chemistry
Upgrades / Variations (same footprint):
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100c — Basic
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3866 — Premium + Viton
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100cv — Molded carbon
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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
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Mechanical Seal 961 (PS-961) — 5/8″
Mechanical Seal 961 (PS-961) — 5/8″
View ProductMechanical 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)
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T-6A footprint for quick, drop-in replacement
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Machined carbon vs. molded carbon for improved surface finish and stability
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Dependable Buna-N for standard pool/spa chemistry
Upgrades / Variations (same footprint)
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1000 — Basic
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3865 — Premium + Viton
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1000cv— Molded carbon
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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
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