Review on Pentek Replacement Housing: Discover the Ultimate Captain Ring Solution by Peter Parks

O-rings were exactly as advertised. It's an O-ring, so there's not much to say about it. But the star of the show is Captain O-Ring. I need them for a leaking water filter. I had no idea who made it or what model it was. If you have ever attempted to measure a ring you know how difficult it is to be absolutely sure of the correct measurements since the groove it is in is on the underside of the body threads. If you then try to find the actual size in the listing description. I was so upset that I considered buying a new filter housing because it would be less of a hassle. I then found this listing for the Captain O-ring and they had a printable comparison sheet, no measurements or guesswork, line it up with the outline that matches what you have, find the part number listed and you're done . It took me 5 minutes and the right part is on its way. The simplest that counted the most. Two thumbs up.