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Pentair 5HP WhisperFloXF Diffuser | 400011Z

Pentair SKU: 400011Z

Pentair 5HP WhisperFloXF Diffuser | 400011Z

Pentair SKU: 400011Z
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Questions about returns? View our return policy.
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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: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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