Pentair 355329Z square front housing o-ring for Challenger pool pumpsPentair Challenger Front Housing O-Ring, 355329Z In stock$2299
Pentair 355329Z square front housing o-ring for Challenger pool pumps
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Pentair Challenger Front Housing O-Ring, 355329Z

Ask a questionMPN 355329Z
$2299
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Quick overview

  • Square profile This o-ring has a square cross section, not round, so a generic round ring will not seat the same way.
  • Fits Challenger pumps The front housing o-ring for Pentair Challenger high flow and high head models.
  • Genuine Pentair Factory part 355329Z, also listed as 355329.
  • Stops housing leaks A flattened or cracked housing o-ring drips at the seam and can let the pump draw air.
  • Rebuild companion Replaced during a Challenger rebuild along with the lid o-ring and shaft seal.
  • Lubricate on install A light coat of silicone o-ring lube helps it seat and extends its life.
Full description and specifications ↓

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Product details

The Pentair 355329Z is the front housing o-ring for Challenger pool pumps, both the high flow and high head models. It is the genuine Pentair part and is also listed as 355329.

Square, not round

This ring has a square cross section. The groove in the Challenger front housing is cut for that profile, so a round ring of similar diameter will not seat or seal the same way. Order the correct part rather than substituting from a generic assortment.

When to replace it

The housing o-ring seals the front housing to the seal plate. As it ages it flattens and hardens, the seam starts to drip, and the pump can pull air on the suction side. It is a standard item in a Challenger rebuild alongside the lid o-ring and shaft seal. A light coat of silicone o-ring lubricant on installation helps it seat and lengthens its life.

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

14 Key 14 on the Pentair Challenger PumpFits every model in the drawing.See it on the diagramAll Pentair Challenger Pump Parts 48 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 355329Z
Alternate part number 355329
UPC 788379699253
Type Front housing o-ring
Cross section Square
Fits Pentair Challenger high flow and high head pool pumps
Shipping weight 0.1 lb
Ships Parcel

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Questions and answers

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

Which pumps does this fit?
Pentair Challenger pool pumps, both the high flow and high head models.
Why is it square instead of round?
The Challenger front housing groove is cut for a square cross section ring. A round o-ring of similar size will not seal the same way, so use the correct 355329Z.
Is 355329 the same part?
Yes. 355329 and 355329Z refer to the same Pentair o-ring.
Should I lubricate it?
Yes. A thin coat of silicone based o-ring lubricant helps it seat evenly and keeps it from pinching when the housing goes back on.
Ask your own question