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Water Filter Housing Compatibility
Captain O-Ring's replacement 63597174C / WP252235 / AO-WH-STD-OR-2 o-rings are compatible with the following filter housings:
- 3M (AquaPure): AP11S, AP11T, AP12S, AP12T, AP26T, AP51T, AP101S, AP101T, AP102S, AP102T, AP110, FHO-34, FHT-34
- 3M AP200/210 Series, APC77, APC78, APCRF (Replaces square ring 36851-35)
- AO Smith AO-WH-PRE, AO-WH-PREV, AO-MF-B
- Project Source PS-WHS-H, PS-WHS-HV
- Watts: 500222, 500223
Note: This image shows where the o-ring is typically positioned, between the filter housing and the filter head.
Frequently Asked Water Filter O-Ring Questions
How often do I need to change my filter housing's o-ring?
Captain O-Ring's high quality replacement water filter housing o-rings are designed for reliable extended use. Still, it is typically recommended to replace your o-ring on every third filter change to ensure it is in top shape to prevent leaks.
Can I use grease or lubricant on these o-rings?
Since Captain O-Ring supplies high quality o-rings without surface imperfections or tacky/sticky surface texture, lubrication is typically not needed if the filter housing sealing surfaces are clean and free of debris. Simply wet the o-rings with water before installing. However, if lubrication is preferred, these Buna Nitrile rubber o-rings are compatible with silicone based and petroleum based lubricants, as well as natural lubricants like vegetable oil.
What if I don't know what o-ring part number my filter housing needs?
Not sure which o-ring part number you need for your filter housing? Use our handy printable water filter housing o-ring size chart. Simply print out the chart and lay your old o-ring on the page to see which o-ring it matches with. You can find the size chart listed as "User Guide [PDF]" under the "Product guides and documents" section or the "downloads" section on this page, depending on your Amazon page layout.
W. A. Smart
2025-07-29 15:27:06
Nice to finally have a company that provides the exact size needed for the Watts filter. While changing the filter cartridge (monthly), I popped out the old gasket/o-ring (rather brittle after so much use), I inserted the new, supple--exact fit--0-ring. It provided such a good seal that I did not need to tighten the outer case nearly as much as before. Great product and fast delivery.
Chuck
2025-06-28 13:01:27
These new o rings fixed my leaky filter case. They don’t look much thicker, but they sealed fine for me.
stephen winter
2025-06-17 11:28:15
purchased these for my water filter Works great!!
Gordon Booth
2025-05-09 15:06:00
works as intended
horace
2025-04-20 18:47:57
these fit my Watts clear housing water filter. I lube the O-ring and threads of the housing with silicone grease and so far so good.
Robert
2025-03-29 11:31:58
Friendly and safe
Customer
2025-01-01 18:55:38
Exact replacement for my A.O. smith water filter.
My2Cents
2024-12-01 18:10:55
The good news is that I could still use the product, but it does not fit my Watts 500222 water filter canister. I had to cut the ring with a sharp utility knife and the lay it in the groove of the canister. I could then see that it was about an 1/8th of an inch too long. I cut it to fit and taped the ends together with very little black, down spout tape. Only once around as to not make a bulge in the ring. Installed it and hand tightened it. Works great.
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