
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.
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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.
| 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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