Pentair 357150 WhisperFlo black plastic cam and ramp clampPentair WhisperFlo Clamp, Cam and Ramp, Plastic, 357150$5499
Pentair 357150 WhisperFlo black plastic cam and ramp clamp
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Pentair WhisperFlo Clamp, Cam and Ramp, Plastic, 357150

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$5499
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Quick overview

  • Genuine Pentair Factory part 357150, the cam and ramp clamp for WhisperFlo pumps.
  • Cam and ramp style The newer locking style, not the older threaded lid arrangement.
  • Black plastic Molded plastic, as originally supplied.
  • Fits WhisperFlo WF and WFE Listed in the Pentair WhisperFlo WF and WFE pump parts group.
  • Holds the lid down The clamp is what pulls the lid onto its o-ring, so a cracked one costs the pump its prime.
  • Match your lid style Cam and ramp clamps pair with the cam and ramp lid, so confirm which style your pump has.
Full description and specifications ↓

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Product details

The Pentair 357150 is the black plastic cam and ramp clamp for the WhisperFlo pump. It is the ring that locks the strainer pot lid down, drawing it onto its o-ring as the clamp is turned.

Why it matters

Everything upstream of the impeller runs under vacuum. If the lid is not being pulled down evenly, the pump does not leak water, it draws air. That shows up as slow priming, an air pocket that will not clear from the strainer pot, a noisier pump and reduced flow. A clamp with a cracked ramp or a broken lug is a common and easily missed cause.

Check the lid style first

WhisperFlo pumps have been built with more than one lid arrangement over the years. This is the cam and ramp style, which pairs with the matching cam and ramp lid. Look at your pump before ordering rather than going by model name alone.

Fitting

Clean the sealing face, lubricate the lid o-ring with a pool rated silicone lubricant, and turn the clamp until it seats. It should draw down with hand pressure. If it takes force, something is not aligned.

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 will not 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

1 Key 1 on the Pentair WhisperFlo PumpFits every model in the drawing.See it on the diagramAll Pentair WhisperFlo Pump Parts 73 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 357150
UPC 788379659707
Type Cam and ramp clamp
Material Plastic
Color Black
Part type Pool pump part
Fits Pentair WhisperFlo WF and WFE pumps
Also listed for Sta-Rite IntelliPro VS+SVRS variable speed pump parts
Shipping weight 0.9 lb
Ships Parcel

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Questions and answers

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

What does the clamp do?
It locks the strainer pot lid down onto its o-ring. The cam and ramp design draws the lid tight as you turn the clamp.
Which pumps does it fit?
It is listed for the Pentair WhisperFlo WF and WFE models, and also appears in the Sta-Rite IntelliPro VS+SVRS variable speed pump parts group.
Is this the older or newer lid style?
It is the cam and ramp style clamp. WhisperFlo pumps were built with more than one lid arrangement, so look at your pump before ordering and match the clamp to the lid you have.
My clamp cracked. Do I need a new lid too?
Not necessarily. If the lid itself is sound and the o-ring seals, replacing the clamp alone is enough. If the lid is crazed or cracked, replace both, since a compromised lid will not seal no matter how good the clamp is.
Ask your own question