Pentair 352626 volute o-ring O-257 for Pac-Fab Hydropump pumpsPentair O-Ring, Volute Hydropump, 352626 In stock$1199
Pentair 352626 volute o-ring O-257 for Pac-Fab Hydropump pumps
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Pentair O-Ring, Volute Hydropump, 352626

Ask a questionMPN 352626
$1199
In stock
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Quick overview

  • Genuine Pentair Factory part 352626 for the Hydropump volute.
  • O-257 size The o-ring is referenced as an O-257, useful when cross checking against an old parts list.
  • Hydropump 590 and 700 Listed for the Pac-Fab Hydropump 590 and 700 series.
  • Seals the volute Sits between the volute and the pump body, where a failure shows as a leak or a loss of prime.
  • Replace it while you are in there Any job that separates the volute is the moment to fit a new o-ring rather than reuse a set one.
  • Lubricate on fitting A silicone based o-ring lubricant helps it seat and keeps it from sticking next time.
Full description and specifications ↓

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Product details

The Pentair 352626 is the volute o-ring for Pac-Fab Hydropump pumps, referenced on older parts lists as an O-257. It is listed for the Hydropump 590 and 700 series.

Where it sits

The ring seals the volute against the pump body. That joint is on the pressure side and on the suction path, so when the ring goes hard, flattens or splits you get one of two symptoms: water weeping from the seam while the pump runs, or a pump that will not hold prime because it is drawing air past the seal.

Fitting

Clean the groove and the mating face before the new ring goes in, and use a silicone based o-ring lubricant so it seats evenly instead of rolling as the volute is drawn up. If you have the pump apart for anything else, fit a fresh ring while it is open rather than reusing one that has already taken a set.

Specifications
Brand Pentair
Manufacturer part number 352626
UPC 788379699543
Type Volute o-ring
Size reference O-257
Part type Pool pump part
Fits Pentair Pac-Fab Hydropump 590 and 700 series
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 pumps does it fit?
It is listed for the Pac-Fab Hydropump 590 and 700 series pumps.
What does O-257 mean?
It is the o-ring size reference carried on the original parts listing. If you are working from an older diagram that calls out O-257 rather than 352626, this is the same ring.
My pump loses prime. Could this be it?
It is one of the things to check. A flattened or split volute o-ring lets air in on the suction side, which shows up as a pump that will not hold prime, and it can also weep water when the pump is running.
Should I grease it?
Use a silicone based o-ring lubricant. It helps the ring seat evenly as the volute closes up, and it stops the ring bonding to the housing so the next teardown is easier.
Ask your own question