Pentair WhisperFloXF / Max-E-ProXF 5 HP Impeller Assembly | 400023Z
The Pentair 400023Z is an OEM impeller assembly used in select
Pentair WhisperFloXF and Sta-Rite Max-E-ProXF high-flow pool pumps. This is the
XF-20 (5 HP) impeller used to move water through the pump by transferring motor energy into flow and pressure.
Replace the impeller if it’s cracked, worn, clogged, or damaged from debris, cavitation, or seal failure.
Key Features
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OEM Pentair impeller assembly for XF-20 (5 HP) pump applications
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Restores proper flow and efficiency when the original impeller is damaged or worn
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Direct-fit replacement for compatible WhisperFloXF / Max-E-ProXF pump wet ends
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Critical hydraulic component that impacts prime, circulation performance, and filter pressure
Compatibility
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Pentair WhisperFloXF pump models that use the XFET-20 / XFE-20 impeller
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Sta-Rite Max-E-ProXF pump models that use the XFET-20 / XFE-20 impeller
Tip: WhisperFloXF pumps use different impellers by pump size (XFET-8, XFET-12, XFET-20, etc.). Confirm your pump model and parts diagram before ordering.
Common Symptoms of a Bad Impeller
- Low flow / weak circulation even with a clean filter and clear baskets
- Difficulty priming or frequent loss of prime
- Unusual grinding, rattling, or vibration from the wet end
- Reduced filter pressure compared to normal operation
- Debris ingestion causing broken vanes or a jammed impeller
Installation Notes
- Turn off power at the breaker and close valves before opening the pump.
- Inspect the diffuser, seal plate, and wear surfaces for damage while the pump is apart.
- Replace the mechanical shaft seal whenever the impeller is removed to help prevent leaks.
- After reassembly, prime the pump fully and check for leaks at the seal plate and unions.
- Pump service should be performed by a qualified pool professional if you are not comfortable working on motor-driven equipment.
Related Products
Maintenance Tips
- Keep baskets and the filter clean—restricted flow can cause overheating and premature wear on pump components.
- If you notice air in the pump basket, fix suction-side leaks early to reduce cavitation damage to the impeller.
- Maintain balanced water chemistry to minimize scaling that can reduce efficiency and stress internal parts.
- Winterize properly in freeze-prone areas—freeze damage can crack the impeller and wet end components.
