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

• Designed for Pentair WhisperFloXF VS 5 HP variable speed pumps requiring the 400000 wet end assembly.

• Compatible with variable speed models where OEM wet end components are specified for WhisperFloXF VS platforms.

• Works with 230 V / 208–230 V electrical configurations typical of high‑horsepower pool circulation systems.

• Suitable for large residential and light commercial pools with heavy flow and complex hydraulics.

• Integrates with standard 2.5″–3″ plumbing unions commonly used in WhisperFloXF installations.

Key Features

• Genuine Pentair part, supplied under manufacturer part number 400000.
• Horsepower: 5 HP.
• Match horsepower, service factor and voltage to your plumbing and circuit.
• Ships from our US warehouse with tracking on dispatch.

Specifications

• Brand: Pentair
• Manufacturer part number: 400000
• Category: Pool Pumps
• Condition: New
• Horsepower: 5 HP
• UPC / GTIN: 788379805845
• Shipping weight: 3 lb

Frequently Asked Questions

Is the 400000 a genuine Pentair part?

Yes. The 400000 is a Pentair part supplied under that manufacturer part number. It is not a generic substitute.

How do I choose the right horsepower?

Match the horsepower and service factor to your existing pump, and check that your filter's design flow rate can handle it. An oversized pump pushes water through the filter too fast and reduces filtration quality.

Is a variable speed pump worth it?

Variable speed pumps typically cut pump energy use by 50 to 80 percent versus single speed, because running longer at low RPM moves the same water for far less power. Several US states now mandate them for replacements above a certain horsepower.

Will this pump fit my existing plumbing?

Check the suction and discharge port sizes and the distance between the pump's mounting feet. Union fittings on most modern pumps allow some adjustment, but a different footprint may need re-plumbing.

Does California Title 20 affect which pump I can buy?

California restricts the sale of single speed replacement pumps above 1 total horsepower, so most residential replacements there must be variable speed. Similar rules apply in several other states.

How do I confirm this part fits my equipment?

Check the part number stamped on the component you are replacing, or find it on the parts schematic in your owner's manual. If the number differs or is unreadable, send us your equipment model and serial number and we will verify fitment before you order.

How quickly does this ship?

In-stock items ship from our US warehouse on business days. You will receive tracking by email once the order leaves the warehouse.

Can I return it if I ordered the wrong part?

Unopened, uninstalled items can be returned within 30 days. Equipment that has been installed or plumbed cannot be returned, so confirm fitment before installation.

Is this covered by a warranty?

Manufacturer warranty terms vary by brand and product. Warranty claims generally require proof of purchase and, on installed equipment, evidence of professional installation.