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Pentair Gaskets

  • c21-10 diffuser ring

    Sta-Rite / Berkeley / Pentair Diffuser Ring C21-10

    Sta-Rite / Berkeley / Pentair Diffuser Ring C21-10

    Sta-Rite / Berkeley / Pentair Diffuser C21-10 — Gasket / Seal Ring

    Pre-cut diffuser seal ring (C21-10) is a direct replacement component designed for use in Sta-Rite, Berkeley, and Pentair pump systems to maintain proper flow and performance. Sized to seat cleanly on the diffuser for even compression and a leak-tight seal during service or rebuilds.

    Cross-reference / Names:

    • Part: C21-10 Diffuser

    • Also called: Diffuser gasket / seal ring

    Compatibility:

    • Motor range: ~1–2.5 HP diffuser applications

    • Pump families: Sta-Rite / Berkeley / Pentair equivalents

    • Also used on: Anthony centrifugal pool pumps (select models)

    Why this part:

    • Direct-fit profile for quick, reliable installs

    • Consistent thickness for uniform sealing pressure

    • Smooth edges for easier alignment and reassembly

    Explore our full lineup of Pre-cut Gaskets.   

    Looking for more? Check out our Shaft Seals, Pump Repair Kits , & Parts/Accessories 

    Have questions?- Call us anytime- we-re here to help 

    Weight .1 lbs
    Dimensions 9 × 9 × 1 in
  • c21-2 diffuser ring

    STA-RITE / BERKELEY / PENTAIR DIFFUSER RING C21-2

    STA-RITE / BERKELEY / PENTAIR DIFFUSER RING C21-2

    Sta-Rite / Berkeley / Pentair Diffuser Ring C21-2

    Pre-cut diffuser ring gasket (C21-2) for Sta-Rite, Berkeley, and Pentair D-series / ED-series pumps. Sized to seat cleanly on the diffuser, providing uniform compression and a leak-tight seal after service or rebuilds.

    Cross-references & use:

    • Part: C21-2 Diffuser Ring

    • Also called: D-Series Diffuser O-Ring / Gasket

    • Pump families: Sta-Rite D & ED series (Berkeley/Pentair equivalents)

    Rebuilding a Sta-Rite D-series pump? The diffuser ring is one of four parts that come out at a standard seal service — you will also need the mechanical seal, the shaft sleeve and the housing gasket.

    All four together in one part number:

    Sta-Rite D-Series Pump Repair Kit — PS-3883 seal, C23-58 shaft sleeve, this C21-2 diffuser ring and C20-46 gasket

    Not sure what your rebuild needs? Call or text 561-414-1046 — no purchase required.

    Explore our full lineup of Pre-cut Gaskets.   

    Looking for more? Check out our Shaft Seals, Pump Repair Kits , & Parts/Accessories 

    Have questions? Call us anytime-we’re here to help 

    Weight .1 lbs
    Dimensions 9 × 9 × 1 in
  • Sta-Rite Pentair PW22-1 check valve flapper, also called a flapper gasket, for DPC Series pumps

    Sta-Rite / Pentair PW22-1Check Valve Flapper (Flapper Gasket)

    Sta-Rite / Pentair PW22-1Check Valve Flapper (Flapper Gasket)

    Item #SH-flapper

    Sta-Rite / Pentair PW22-1 — Flapper Gasket

    The replacement check valve flapper for Sta-Rite DPC Series pumps, Sta-Rite / Pentair part PW22-1. Commonly called a flapper gasket, and listed by the manufacturer as a check valve flapper — the same part under both names.

    Lower your cost per gasket with quantity-based pricing—discounts are automatically applied at checkout as your order quantity increases. See the pricing table above.

    Fits

    • Brand: Sta-Rite / Pentair

    • Part: PW22-1

    • Series: DPC Series medium head centrifugal and self-priming utility pumps

    Need Help?

    Not sure this is your part? Send a photo of the old flapper and your pump model to info@sealhouseusa.com, or call or text 561-414-1046 — our specialists will confirm it. No purchase required.

    Explore our full lineup of Pre-cut Gaskets.   

    Looking for more? Check out our Shaft Seals, Pump Repair Kits , & Parts/Accessories 

    Have questions?- Call us anytime- we-re here to help 

    Weight .1 lbs
    Dimensions 4 × 4 × 1 in