Pentair 357255 SuperFlo pump lid o-ring, size 2-357Pentair O-Ring, 2-357, 357255$1099
Pentair 357255 SuperFlo pump lid o-ring, size 2-357
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Pentair O-Ring, 2-357, 357255

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$1099
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Quick overview

  • Genuine Pentair The factory o-ring, part number 357255.
  • Size 2-357 The standard size designation, which is how the ring is identified across parts lists.
  • SuperFlo lid Listed as the lid o-ring for Pentair SuperFlo pool pumps.
  • Also cataloged elsewhere It appears with Pentair OptiFlo and Sta-Rite SuperMax pump parts as well.
  • A prime problem in disguise A pump that loses prime or holds air in the pot very often has a tired lid o-ring behind it.
  • Silicone lubricant only Use a pool rated silicone lubricant on the ring, not a petroleum grease.
Full description and specifications ↓

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Product details

The Pentair 357255 is the genuine lid o-ring, size 2-357, for SuperFlo pool pumps. Pentair also lists it with OptiFlo and Sta-Rite SuperMax pump parts.

The o-ring that causes prime problems

The lid o-ring seals the strainer pot against atmosphere while the pump pulls a vacuum on it. Once the ring hardens, flattens or picks up a nick, air gets in past it, and the pump either refuses to prime or runs with a pocket of air trapped under the clear lid. It looks like a suction line problem and it usually is not.

Fitting and care

Clean the groove and the lid seat before the new ring goes on, and use a silicone lubricant intended for pool equipment. Petroleum grease will swell and break down the rubber. Do not overtighten the lid to make a worn o-ring seal, since that distorts the ring and the lid without solving anything.

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

6 Key 6 on the Pentair SuperFlo PumpFits every model in the drawing.See it on the diagramAll Pentair SuperFlo Pump Parts 38 parts and the drawing
Specifications
Brand Pentair
Manufacturer part number 357255
UPC 788379688509
Type Lid o-ring
Size 2-357
Fits Pentair SuperFlo pumps
Also cataloged with Pentair OptiFlo, Sta-Rite SuperMax pump parts
Part type Pool pump part
Shipping weight 0.05 lb
Ships Parcel

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Questions and answers

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

Which pump is this for?
It is listed as the lid o-ring for Pentair SuperFlo pumps. It is also cataloged with Pentair OptiFlo and Sta-Rite SuperMax pump parts.
What does 2-357 mean?
It is the standard size designation for the ring. Pentair sells it under part number 357255.
My pump keeps losing prime. Is this the fix?
It is the first thing to check. A lid o-ring that has hardened or flattened lets air into the pot, and the symptom is a pump that will not hold prime or that runs with air trapped under the lid.
What lubricant should I use?
A silicone lubricant made for pool equipment. Petroleum based grease breaks the rubber down over time.
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