Pentair 400011Z diffuser for the 5 HP WhisperFlo XF pumpPentair WhisperFlo XF 5 HP Diffuser, 400011Z In stock$11899
Pentair 400011Z diffuser for the 5 HP WhisperFlo XF pump
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Pentair WhisperFlo XF 5 HP Diffuser, 400011Z

Ask a questionMPN 400011Z
$11899
In stock
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Quick overview

  • Genuine Pentair Factory part 400011Z, not an aftermarket copy.
  • For the 5 HP XF pumps Fits the 5 HP WhisperFlo XF and Max-E-Pro XF inground pumps.
  • Horsepower specific XF diffusers are matched to the impeller, so the 5 HP part is not interchangeable with other sizes.
  • Restores flow A cracked or worn diffuser costs the pump both prime and output.
  • Pairs with the impeller Worth replacing alongside the impeller when the wet end is opened up.
  • Direct replacement Drops into the same position as the original diffuser.
Full description and specifications ↓

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Product details

The Pentair 400011Z is the diffuser for the 5 HP WhisperFlo XF and Max-E-Pro XF inground pool pumps. It is the genuine Pentair part.

What the diffuser does

The diffuser sits over the impeller in the wet end and converts the spinning flow leaving the impeller into steady pressure heading out of the pump. It is also what lets the pump hold prime. When it cracks, warps or wears at its sealing face, the pump becomes noisy, loses pressure and struggles to prime, and the impeller usually takes the blame.

Getting the right one

XF diffusers are matched to horsepower. This is the 5 HP part, so check the rating on your motor plate before ordering. Since the wet end is already open when the diffuser is changed, it is a sensible time to look at the impeller and the seal as well.

Specifications
Brand Pentair
Manufacturer part number 400011Z
UPC 788379867201
Type Pump diffuser
Horsepower 5 HP
Fits Pentair 5 HP WhisperFlo XF and Max-E-Pro XF inground pumps
Shipping weight 0.8 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 diffuser fit?
Pentair lists 400011Z for the 5 HP WhisperFlo XF and Max-E-Pro XF inground pumps.
Will it work on a smaller WhisperFlo XF?
No. This is the 5 HP diffuser. Other horsepower ratings in the XF line use their own diffuser part numbers.
Is this a genuine Pentair part?
Yes. It is the Pentair OEM diffuser, part number 400011Z.
Why would a diffuser need replacing?
The diffuser sits over the impeller and shapes the flow leaving it. If it cracks, warps or wears at the sealing face the pump loses prime and pressure, and the symptom is often mistaken for a bad impeller.
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