Sta-Rite U9-375 trap cover o-ring, 6-1/4 inch inside diameterSta-Rite Trap Cover O-Ring In stock$2699
Sta-Rite U9-375 trap cover o-ring, 6-1/4 inch inside diameter
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Sta-Rite Trap Cover O-Ring

Ask a questionMPN U9-375, O-12
$2699
In stock
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Quick overview

  • Two part numbers Carried as U9-375 and as O-12, both referring to this trap cover o-ring.
  • 6-1/4 inch inside diameter Measured ID of the ring, with a 1/4 inch cross section.
  • Trap lid seal This is the ring that seals the pump strainer pot lid, so it is the part that decides whether the pump holds prime.
  • Listed for Dyna-Glas and Dyna-Max Called out for Sta-Rite Dyna-Glas and Dyna-Max pumps from 3/4 through 2 HP.
  • Appears on more diagrams Also shown on the Sta-Rite Max-E-Glas II and Dura-Glas II and the Pentair Dyna-Wave pump parts diagrams.
  • Lubricate every time A silicone o-ring lubricant keeps the ring from sticking to the lid and tearing when the pot is opened next.
Full description and specifications ↓

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Product details

This is the trap cover o-ring for Sta-Rite pumps, carried as part number U9-375 and also as O-12. It measures 6-1/4 inches on the inside diameter with a 1/4 inch cross section, and it is listed for the Sta-Rite Dyna-Glas and Dyna-Max pumps from 3/4 through 2 HP.

Why it matters more than it looks

The trap cover o-ring is the seal between the strainer pot and its lid, which puts it on the suction side of the pump. Anything that is not airtight there does not leak water out, it draws air in. That is the difference between a pump that primes and holds and one that runs half full of air, loses flow, and eventually runs its seal dry.

What our source says, and where it disagrees

The listing carries the Sta-Rite brand and two part numbers, U9-375 and O-12, while the description also refers to the ring as generic. We have kept both readings rather than choose one. It appears on the Sta-Rite Max-E-Glas II and Dura-Glas II, Dyna-Glas and Dyna-Max, and Pentair Dyna-Wave pump parts diagrams.

Fitting

Wipe the groove and the lid face clean, seat the ring without twisting it, and use a silicone based o-ring lubricant. That lubricant is not optional on a lid that gets opened for basket cleaning, since a dry ring bonds to the lid and tears the next time the pot is opened.

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
Specifications
Brand Sta-Rite
Manufacturer part number U9-375, O-12
UPC 788379850982
Part type Pool Pump Part
Type Trap cover o-ring
Inside diameter 6-1/4"
Cross section 1/4"
Fits Sta-Rite Dyna-Glas and Dyna-Max pumps, 3/4 through 2 HP models
Shown on diagrams for Sta-Rite Max-E-Glas II and Dura-Glas II pump parts; Sta-Rite Dyna-Glas and Dyna-Max pump parts; Pentair Dyna-Wave pump parts
Source note Listed under the Sta-Rite brand, while the source description also calls the ring generic. Both readings are carried here.
Shipping weight 0.1 lb
Ships Parcel

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Questions and answers

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

Is this an OEM Sta-Rite ring or a generic?
Our source is not consistent. It is carried under the Sta-Rite brand with the part numbers U9-375 and O-12, and the product description also calls it generic. We have carried both rather than pick one.
Why are there two part numbers?
The ring is listed as U9-375 and as O-12. Either number refers to the same trap cover o-ring, so do not order both looking for two different rings.
What size is it?
6-1/4 inches inside diameter with a 1/4 inch cross section.
My pump keeps losing prime. Is the lid o-ring the cause?
Very often, yes. A flattened, cracked or dried out trap cover o-ring lets air into the suction side, and the pump then loses prime or runs with air in the pot. Clean the groove, fit a fresh ring and lubricate it with a silicone o-ring lubricant.
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