Pentair 152509 square section 8.5 in. closure o-ring for Challenger pumpsPentair Genuine OEM O-Ring, Square 8.5 in. Closure, 152509 In stock$1399
Pentair 152509 square section 8.5 in. closure o-ring for Challenger pumps
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Pentair Genuine OEM O-Ring, Square 8.5 in. Closure, 152509

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$1399
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Quick overview

  • Genuine Pentair OEM part 152509, the square section o-ring Pentair fits at the factory.
  • Square cross section Made for the 8.5 in. closure groove; a round o-ring will not seat the same way.
  • Challenger pumps The lid o-ring for Challenger high head and high flow models.
  • Triton sand filters Also listed for the Triton II TR40 through TR140, the commercial TR100C and TR140C, and the Triton C-3.
  • Stops air leaks A flattened or cracked lid o-ring lets air into the pump; a new one restores a full prime.
  • Lube on install A light coat of silicone o-ring lubricant helps the seal seat and last.
Full description and specifications ↓

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Product details

Pentair part 152509 is the square section o-ring for the 8.5 in. closure on Challenger high head and high flow pumps. It is the genuine Pentair part, and it also appears in the parts lists for several Triton side mount sand filters: the Triton II TR40, TR50, TR60, TR100 and TR140, the commercial TR100C and TR140C, and the Triton C-3.

Why the profile matters

The closure groove is cut for a square cross section. Fitting a round o-ring of roughly the right diameter tends to end in a lid that will not seal, air in the pump basket and a pump that struggles to hold prime. Replacing the o-ring with the correct square section part is the fix.

Installing it

Clean the groove, wipe a light film of silicone o-ring lubricant onto the new o-ring and seat it before closing the lid. Avoid petroleum based lubricants, which attack the rubber.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it won't catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read

Where this part goes

27 Key 27 on the Pentair Challenger PumpFor the High Flow 5F (High Flow 5F).See it on the diagramAll Pentair Challenger Pump Parts 48 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 152509
UPC 788379693503
Part type Pool pump part
Profile Square section o-ring
Closure size 8.5 in.
Fits Pentair Challenger high head and high flow pumps; Triton II TR40, TR50, TR60, TR100, TR140; Triton II TR100C, TR140C; Triton C-3 side mount sand filters
Shipping weight 0.02 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which Pentair pumps use this o-ring?
The Challenger high head and high flow models. It is the square section o-ring under the 8.5 in. strainer lid.
It is listed for sand filters too. Is that right?
Yes. The same 152509 o-ring appears in the parts lists for the Triton II TR40, TR50, TR60, TR100 and TR140, the commercial TR100C and TR140C, and the Triton C-3 side mount sand filters.
Why is the cross section square?
The closure groove is cut for a square profile. A round o-ring of the same diameter can roll or pinch instead of sealing flat.
Should I lubricate it?
Yes, a light film of silicone o-ring lubricant on the new o-ring helps it seat and extends its life. Do not use petroleum based grease.
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