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Pentair 5HP WhisperFloXF Diffuser | 400011Z

Pentair SKU: 400011Z

Pentair 5HP WhisperFloXF Diffuser | 400011Z

Pentair SKU: 400011Z
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Pentair WhisperFloXF / Sta-Rite Max-E-ProXF 5 HP Diffuser | 400011Z

The Pentair 400011Z is an OEM pump diffuser for select 5 HP XF-series high-flow pool pumps. The diffuser sits over the impeller and helps guide water through the wet end, improving hydraulic efficiency, supporting strong prime, and reducing turbulence and cavitation compared to running with a damaged or worn diffuser.

Key Features

  • OEM XF-series diffuser: direct-fit replacement for compatible 5 HP XF pump wet ends.
  • Improves hydraulic performance: properly channels water leaving the impeller for efficient flow and pressure.
  • Helps restore prime and circulation: a worn/cracked diffuser can contribute to noisy operation and reduced performance.
  • Critical wet-end component: protects and supports correct impeller-to-volute flow path.

Compatibility

  • Used on: Pentair WhisperFloXF pumps: XFE-20, XFJ-20, XFK-20
  • Used on: Sta-Rite Max-E-ProXF pumps: XFE-20, XFJ-20, XFK-20

Tip: XF pumps use different diffusers by horsepower/model. Match your pump model (XFE/XFJ/XFK) and parts diagram to confirm 400011Z.

Common Reasons to Replace

  • Cracked or broken diffuser vanes from debris ingestion
  • Excessive noise, vibration, or signs of cavitation
  • Low flow / weak circulation after confirming baskets and filter are clean
  • Diffuser damage caused by running with a failed shaft seal or prolonged air ingestion

Installation Notes

  • Shut off power at the breaker and close valves before opening the pump.
  • Inspect the impeller and wear surfaces while the pump is apart; replace damaged parts together when needed.
  • Replace the mechanical shaft seal any time the wet end is opened for major service to help prevent leaks.
  • After reassembly, prime fully and check for leaks at the seal plate, drain plugs, and unions.

Specifications

  • Brand: Pentair
  • Part Number: 400011Z
  • Part Type: Diffuser
  • Application: XF-series 5 HP pump wet end
  • UPC: 788379867201
  • Quantity: Sold individually

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Maintenance Tips

  • Keep skimmer/pump baskets and the filter clean to reduce restriction that can cause cavitation and premature diffuser wear.
  • Fix suction-side air leaks early—running the pump with air in the system can damage wet-end components over time.
  • If you open the pump for service, clean debris from the volute area and confirm the diffuser seats evenly before tightening fasteners.
Questions about returns? View our return policy.

Hours Of Operation: 

Monday - Friday: 8:00 am to 4:00 pm Phoenix Time

Saturday and Sunday: Closed

  • Orders costing more than  $300 WILL be required to have signature confirmation upon delivery.
  • Handling time is typically only 1 day.   
  • Any item ordered after 1pm Phoenix time, may not ship same-day.
  • Call us if you require expedited shipping and we can give you quotes based on your needs.

Return Policy:

  • All products, except as noted below, are eligible for return up to 30 days after receipt of item.
  • For returns, an RMA form must be filled out HERE or customers can call for additional help.
  • Shipping costs will be deducted from all returned items.
  • Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in. 
  • Items broken, damaged, or inoperable due to installer error will not be refunded.
  • Fill out the return form or give us a call to obtain an RMA and return shipping label.
  • There are no returns on the Pentair Colorsync 618031
  • No returns on pool cleaners.
  • No returns on opened seals and o-rings.
  • No returns on capacitors.
  • If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
  • All products denied upon arrival at customers house WILL be charged the cost to ship.
  • Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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