Pentair | 400000 | WhisperFloXF VS Wet End Assembly – Replacement for 5HP Variable Speed Pumps
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The Pentair 400000 WhisperFloXF VS Wet End Assembly is a complete OEM replacement wet end designed to restore high‑performance hydraulics in 5 horsepower variable speed pool pumps. This wet end assembly includes the strainer housing, volute, diffuser, and other flow‑critical components engineered to work together to maximize water circulation and minimize energy loss.
Built from robust, corrosion‑resistant materials, the WhisperFloXF VS wet end assembly is ideal for systems with high flow demands, long plumbing runs, water features, and variable speed performance requirements. Installing this complete assembly helps ensure stable pressure, improved suction, and consistent system efficiency—especially in large residential or light commercial pool applications.
Pentair 400000 WhisperFloXF VS Wet End Assembly Compatibility
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Designed for Pentair WhisperFloXF VS 5 HP variable speed pumps requiring the 400000 wet end assembly.
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Compatible with variable speed models where OEM wet end components are specified for WhisperFloXF VS platforms.
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Works with 230 V / 208–230 V electrical configurations typical of high‑horsepower pool circulation systems.
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Suitable for large residential and light commercial pools with heavy flow and complex hydraulics.
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Integrates with standard 2.5″–3″ plumbing unions commonly used in WhisperFloXF installations.
Frequently asked questions
Is a variable speed pump worth it?
Variable speed pumps draw dramatically less power at low speed because energy use falls far faster than flow does. Many jurisdictions now require variable speed for new and replacement residential pool pumps above a certain horsepower, so check local code before buying single-speed.
What is the part number for this pump?
Pentair lists this pump under part number 400000. Quote 400000 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
How do I match a pump to my pool?
Work from the plumbing rather than the pool size: line diameter, total dynamic head and the flow your filter and heater can accept all cap the useful pump size. An oversized pump on undersized plumbing wastes power and can exceed the filter's rated flow.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
What do I need to check before installing this pump?
Confirm the voltage, the union or port sizes and the mounting footprint against your existing installation. Pump replacement usually involves electrical connections and may require a licensed electrician depending on local requirements.
Is there a warranty on this pump?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.