The number 5 Slim-Line clear housing sump fits on Pentek, Culligan, Ametek, Kleen-Plus, USFilter, and American Plumber number 5 Slim-Line clear housings. The number 5 Slim-Line Sump may not fit on other brands. The Pentek 153056 number 5 Slim-Line housing should be changed at least every 5 years. The number 5 clear housing sump fits number 5 Slim-Line caps with any inlet/outlet size. If you have a Blue housing canister, you CANNOT replace it with a Clear housing canister and vice versa. If you have a number 5 Clear Housing Sump, the Pentek 153056 sump is interchangeable with American Plumber, Ametek, Culligan, Kleen-Plus, Pentek, and USFilter brands. Sump does not come with an o-ring. The number 5 Clear Slim-Line canister holds 5-inch L x 2.5-inch W water filters.