Pentair 355227Z WhisperFlo WFE diffuser o-ringPentair WhisperFlo WFE Diffuser O-Ring, 355227Z In stock$699
Pentair 355227Z WhisperFlo WFE diffuser o-ring
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Pentair WhisperFlo WFE Diffuser O-Ring, 355227Z

Ask a questionMPN 355227Z
$699
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Quick overview

  • Genuine Pentair Factory o-ring 355227Z, sized for the WhisperFlo diffuser.
  • WhisperFlo WF and WFE The o-ring used on the WF and WFE model pumps.
  • Seals the diffuser Closes the path between the diffuser and the volute so water leaving the impeller has only one way to go.
  • Cheap insurance A flattened o-ring costs flow quietly, and the part itself is one of the least expensive in the pump.
  • Change it while you are in there Any time the pump is opened for a seal or an impeller, this is the o-ring worth replacing.
  • Use silicone lubricant O-ring lubricant made for pool equipment helps it seat and makes the next teardown easier.
Full description and specifications ↓

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Product details

The Pentair 355227Z is the diffuser o-ring for WhisperFlo pumps in the WF and WFE range. It seals the diffuser against the volute so that water leaving the impeller has only one way to go.

Why a small o-ring matters

When this o-ring flattens, hardens or splits, water short circuits back around the diffuser rather than passing through it. The pump keeps running, the motor sounds exactly as it always has, and the only symptom is less water at the returns. That is easy to blame on a dirty filter, a clogged basket, or a tired impeller, which is why a worn diffuser o-ring can go unfound for a season.

Fitting

Wipe the groove clean of grit before seating the new ring, and use a thin film of an o-ring lubricant intended for pool equipment. That helps it seat evenly and keeps it from tearing or sticking the next time the pump is opened.

Since reaching the diffuser means opening the pump anyway, it is worth ordering the seal kit or a spare seal plate gasket at the same time.

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

32 Key 32 on the Pentair IntelliFlo PumpFits every model in the drawing.See it on the diagramAll Pentair IntelliFlo Pump Parts 75 parts and the drawing11 Key 11 on the Pentair WhisperFlo PumpFits every model in the drawing.See it on the diagramAll Pentair WhisperFlo Pump Parts 73 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 355227Z
UPC 788379720575
Type Diffuser o-ring
Part type Pool pump part
Fits Pentair WhisperFlo WF and WFE series pumps
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 pumps use this o-ring?
Pentair WhisperFlo pumps in the WF and WFE model range.
Where does it sit?
Between the diffuser and the volute, sealing the diffuser in place over the impeller.
What happens if it is worn?
Water short circuits around the diffuser instead of through it. The pump keeps running and sounds fine, but it moves less water.
Should I lubricate it?
Yes. A thin film of an o-ring lubricant made for pool equipment helps it seat correctly and makes the next service easier.
Ask your own question