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  • 3.5” O-Rings for APEC Essence, Ultimate Reverse Osmosis RO Water Filter Housings (4 Pack)

3.5” O-Rings for APEC Essence, Ultimate Reverse Osmosis RO Water Filter Housings (4 Pack)

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$9.29
$9.29
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  • 4 Pack of o-rings (also called gaskets or seals) compatible with APEC Ultimate and Essence RO Reverse Osmosis Drinking Water Systems.
  • 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 (see images for more info).
  • 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.
  • 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 (Version B is slightly smaller than Version A). Check the info above and images to determine which version you need for your system.
  • Molded from Buna-N rubber for long lasting performance and reliability. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!


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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!
Visa, Mastercard, American Express, Discover, and other cards accepted
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Captain O-Ring LLC is an ISO9001:2015 certified company.
​Captain O-Ring LLC
1020 Jersey Ave
​​Gloucester City, NJ 08030

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