DISCONTINUED AND NO LONGER AVAILABLE - ORDER THE CULLIGAN OPTION IN THE DROP DOWN BOX. Pentek RO-3000 RO-3500 #155923-43 D-15 Replacement Water Filter Cartridges. One year set. 3 combination sediment / carbon prefilters and one GAC granular activated carbon filter. For RO-3000 & RO-3500 Reverse Osmosis Systems by Pentek And Comaptible With Culligan, Kleen Plus, American Plumber, US Filter & Many Other brands of RO Reverse Osmosis Systems. RO Membrane sold separately.
Pentek # 151121 O-Ring For Slim Line Water Filter Housing Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. O-Ring For Slim Line Water Filter Housing. Buna-N FDA Grade. (Slim Line Housings Use A 3 1/2" diameter "O" Ring) Ametek # 151121 Same as Culligan OR-38 O-ring.