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961 Mechanical Seal (PS-961) — 5/8″ | Pentair IntelliFlo, WhisperFlo & Polaris PB4-60 Pool Pumps

ps-1000 ,ps-961 ps-3865 mechanical seal

961 Mechanical Seal (PS-961) — 5/8″ | Pentair IntelliFlo, WhisperFlo & Polaris PB4-60 Pool Pumps

Weight .25 lbs
Dimensions 1.5 × 1.5 × 1.25 in
QTY Price

$6.99
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  • DESCRIPTION

    Mechanical Seal 961 — T-6A (5/8″) | PS-961

    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

    Fits: Pentair IntelliFlo®, WhisperFlo® and Ultra-Flo (071734S), the Polaris PB4-60 booster pump, Jandy, Sta-Rite and American Products Eagle and Maxim pool pumps, plus Astral Pool, Doughboy, Gecko and Acura spa systems. Pentair IntelliFloXF takes the PS-201; the Polaris PB4-60Q takes the PS-3890.

    Same seal, same size, same fit — what changes is the material and how it’s built. All five seals below are the PS-1000 for a 5/8″ shaft, and all five fit the same pumps. They differ in two ways. The build: a molded carbon face or a premium carbon face machined from solid stock. The materials: a ceramic or silicon carbide seat, and Nitrile or Viton rubber. Pick the one that suits your water.

    Seal Material Best For This Water
    1000 Molded carbon face, ceramic seat, Nitrile rubber Normal chlorine, normal temperature, clear water. The standard build for a home pool or spa.
    1000cv Molded carbon face, ceramic seat, Viton rubber Saltwater or higher chlorine, and warmer water. Viton holds up where standard Nitrile hardens and cracks.
    961 Machined premium carbon face, ceramic seat, Nitrile rubber Saltwater pools with a chlorine generator, commercial pools, or any pump that runs most of the day.
    3865 Machined premium carbon face, ceramic seat, Viton rubber High chlorine and hot water — heated spas, therapy pools, heavy commercial duty.
    1000cvss Silicon carbide face and seat, Viton rubber Sandy, dusty or gritty water, or any pump where seals keep failing early. The hardest faces we offer.

    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
  • SPECIFICATIONS
    Cross references & alternative part numbers

    OEM numbers: 071734S, 071734SP , 017164 , 017165 , 071734S

    Brands: Intelliflo®

    Nameplate Data: ENPO PUMP COMPANY (Division of CRANE PUMPS & SYSTEMS) , LITTLE GIANT PUMP COMPANY (Division of FRANKLIN ELECTRIC COMPANY, INC.) , PENTAIR POOL PRODUCTS

    Also known as / searched as

    • PS-961 mechanical seal

    • 961 mechanical seal

    • T-6A mechanical seal 5/8

    • Type 6 mechanical seal 5/8

    • pool pump mechanical seal 5/8

    • spa pump mechanical seal 5/8

    • machined carbon ceramic mechanical seal

    Common search terms
    PS-961, PS 961, PS961, 961 seal, T6A seal, T-6A seal, type 6 seal 5/8, 5/8 pool pump seal, 1.25 x 0.406 seal seat

  • PHYSICAL PROPERTIES

    Seal House Type 6
    Our Type 6 configuration combines the best design elements we’ve refined over the years to deliver superior reliability and performance.

    Key advantages include:

    • Crimped rotary face with positive drive — securely held in place to prevent dislodgment during installation.

    • Full metal retainer with positive drive — ensures strength and long-term durability.

    • Full rubber bellows construction — provides complete sealing along both the shaft and face, rather than relying on a small O-ring or partial gasket.

    • Pure, resin-impregnated carbon machined from stock; high wear and chemical breakdown resistance.

    Compatibility & upgrade:

    The Type 6 is designed to replace most small seal types commonly used in pool and spa applications, including Type 16, G, A, 6, AV, 2100, and more. Even in its basic form, this seal is a significant upgrade over standard “pool” seals typically available on the market.

Disclaimer: Seal House USA provides aftermarket replacement parts. Any OEM names are used strictly for cross-reference. We are an independent supplier.

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