Pentair 072928Z black 3 HP diffuser assembly for WhisperFlo and IntelliFlo pumpsPentair Black WhisperFlo/IntelliFlo Diffuser Assembly 3HP, 072928Z In stock$4499
Pentair 072928Z black 3 HP diffuser assembly for WhisperFlo and IntelliFlo pumps
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Pentair Black WhisperFlo/IntelliFlo Diffuser Assembly 3HP, 072928Z

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$4499
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Quick overview

  • Genuine Pentair Factory part 072928Z, in black.
  • 3 HP models This diffuser is the 3 HP version. Other horsepowers take their own diffuser.
  • Builds pump pressure The diffuser slows the water leaving the impeller, which converts velocity into pressure.
  • WhisperFlo and IntelliFlo Used on the Pentair WhisperFlo WF and WFE pumps and the IntelliFlo VS3050 and VF pumps.
  • Rebuild companion Usually replaced with the impeller, the diffuser o-ring and a seal and gasket kit while the pump is open.
  • Fixes lost performance A cracked or worn diffuser lets water bypass the impeller, and the pump moves less water for the same energy.
Full description and specifications ↓

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Product details

The Pentair 072928Z is the black diffuser assembly for 3 HP WhisperFlo and IntelliFlo pool pumps. It is the genuine Pentair part, also listed as 072928.

What the diffuser does

The impeller throws water outward at speed. The diffuser wraps around it and slows that water down on its way into the volute, which turns velocity into pressure. Without a good diffuser the pump spins and moves water, but it does not build the head it should, and the whole system runs soft.

Signs it needs replacing

A diffuser that has cracked, warped or lost its sealing face lets water short circuit back to the impeller eye. Flow drops, the filter pressure reads low, and the cleaner or spa jets go weak while the motor draws the same power as before.

While the pump is apart

Replace the diffuser o-ring at the same time, and consider the impeller and a seal and gasket kit if the pump has a few seasons on it. The same teardown reaches all of them.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it won't catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read

Where this part goes

30 Key 30 on the Pentair IntelliFlo PumpFor the VS or 2 VST, before October 2020 (VS or 2 VST, before October 2020), VSF, before October 2020 (VSF, before October 2020), VS+SVRS, before October 2020 (VS+SVRS, before October 2020), VS+SVRS, after October 2020 (VS+SVRS, after October 2020).See it on the diagramAll Pentair IntelliFlo Pump Parts 75 parts and the drawing13 Key 13 on the Pentair WhisperFlo PumpFor the WF-12 (3 HP).See it on the diagramAll Pentair WhisperFlo Pump Parts 73 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 072928Z
Alternate part number 072928
UPC 788379699666
Type Diffuser assembly
Color Black
Horsepower 3 HP
Part type Pool pump part
Fits Pentair WhisperFlo WF and WFE pumps, Pentair IntelliFlo VS3050 and VF pumps
Shipping weight 0.7 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

What does a diffuser do?
It sits around the impeller and slows the water on its way out. Slowing the flow converts its speed into pressure, which is what pushes water through the filter and back to the pool.
Will it fit a smaller WhisperFlo?
This one is the 3 HP diffuser. Pentair uses a different diffuser for other horsepower ratings, so match the part to the pump.
Is 072928 the same as 072928Z?
Yes. The two numbers refer to the same Pentair diffuser assembly.
What else should I replace while the pump is open?
The diffuser o-ring, and usually the impeller and a seal and gasket kit. The same teardown reaches all of them, so doing them together saves a second job.
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