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Your cart is empty.Get your leaking RO filter housings back in working order with Captain O-Ring’s replacement o-ring set. Includes four (4) o-rings so you can keep your system in top shape. Compatible with APEC Ultimate and Essence Reverse Osmosis Drinking Water Systems.
Compatible with APEC Reverse Osmosis Filter Housing Models: RO-45, RO-90, RO-PERM, RO-PUMP, ROES-50, ROES-PH75, ROES-UV75, ROES-UV75-55 and ROES-PHUV75.
This o-ring is available in two versions to cover different dates of these models:
Version A (P/N: O-RING-SET) is compatible with APEC ESSENCE RO units made before June, 2013 and ULTIMATE RO units made before May 2015.
Version B (P/N: O-RING-SET-B) is compatible with APEC ESSENCE RO units made after June, 2013 and ULTIMATE RO units made after May 2015.
O-Rings measure approximately 3.5” diameter and are slightly over 1/8” thick. Version A and B are very similar in size, but vary slightly. Check the info above to determine which version you need for your system. Version B is slightly smaller than Version A.
Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!
Sim
2025-08-15 13:45:27
They were delivered in time, quality is good, and these rings worked like a breeze. Overall very good and if the highest quality. The installation was straightforward as you just had to insert them. The size is a good fit as well.
Christopher Omarah
2025-08-14 14:23:25
Pretty straight-forward, but always nice when an order of something arrives quickly and works as intended without hassle.
dbez
2025-06-23 14:57:47
They are round and rubbery and fit like they should
Lan B.
2025-05-06 15:03:15
It's worked perfectly !!
MCGYVER1
2025-04-03 20:02:35
the ones that I bought this time were the three and a half inch the first time I bought them they were not three and a half inch you're like 3 in they're too smallThey work just fine they're a good quality yeah you don't get a lot for your money but they're still okay the first ones I bought said they were 3 1/2" they weren't they were too small I think they put them in the wrong package they were shipped out of China it's not Amazon's fault but you got to , these are true three and a half inch o-rings watch it sometimes it'll say one thing on the pack and if you don't measure it or check it out it might be just the opposite of what you need
J. Linton
2025-03-12 14:24:12
Thanks to the year/model description the seller provides ordered the correct o-rings and they appear to be identical to the originals minus the flat spots causing them to leak.
MC K.
2025-03-06 15:42:38
The order said 4 o rings but the package only had 3 in it.
Chris F
2025-03-04 15:11:03
These are just as described and worked perfectly to fix our leaking RO system.
Sally M.
2025-01-29 18:31:56
Lost an o-ring when cleaning our cottage unit and these were delivered quickly and a perfect fit.
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