Part # 9239-04

Manufacturer Code STWC9-3

Dimensions 10" L x 10" W x 0.25" D

Alternate Part #'s 13-0220-09-R, 171021006, 35505-1365, 355051365, 47-0448-05-R, 47044805, O-1010, O-239, O239, SPX4000T, STA0513783, STWC93, WC9-3, WC93, 90-423-5448, AEQO239, APCO2081

Product Description

10" O-ring used on the Hayward Northstar Pumps and Sta-Rite Posi-Flo Filters.

Frequently Bought with O-rings

Magic Lube O-ring Lubricant


?     Asked on 6/17/2017by Inyo Visitor

I have a sta rite 135 cartridge filter that is encased in a single stainless steel cylinder and I am looking to buy the replacement o-ring gasket that is located between the base and the stainless steel cylinder

A  Answered on 6/17/2017 by InyoPools Product Specialist Hector F.

Looks like you would need key number 4B on the parts diagram here.

?     Asked on 8/2/2018by Inyo Visitor

I have a posi flo pool filter model # 100TXR. Im looking for the rubber rings that fit between base and bottom of metal cylinders that hold filters. Not sure of diameter of rubber ring. Does it vary? Are there different sizes or does model number only use one specific size? Thanks so much!! Filters are leaking quite a bit.

A  Answered on 8/3/2018 by InyoPools Product Specialist Hector F.

The o-ring for your specific model filter is part number 9239-04

?     Asked on 2/9/2019by Inyo Visitor

For the Sta-Rite filter (posi-flow) model T-70TX , you list the bottom O-Ring WC9-3 which matches my parts spec. but not a top o-ring. My spec diagram show the top O-Ring as part #U9-301. and states they are not interchangeable. My question is will your part #WC9-3 work on both top and bottom of the filter tank ? I want to order a filter cartridge replacement ( your part # NFC 2540 and both top and bottom O-Rings for the tank. please advise...Thank You...E. Montee .

A  Answered on 2/13/2019 by InyoPools Product Specialist Michelle B.

Hello, Yes, they are compatible.

?     Asked on 3/27/2020by Ed Goldberg

I ordered the top and bottom o rings for a Sta-rite posi flow model PTM100 a 4686-03 top and a 9239-04 bottom. I received two bagged o rings that do not match the numbers I ordered. One is a WC93 Starite o ring (APCO2081 or APCO239) and the second one is APCO2252 (355329 PACFAB o-ring or 0-419) Are these the correct ones and which one is the bottom o-ring? Thanks


A  Answered on 3/27/2020 by InyoPools Product Specialist Lennox H.

Hi, Ed. Yes, those O-rings are interchangeable. 


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