Some filter housing do require a thicker that is just over 3/16” thick and just under and over the inside and outside dimensions accordingly. If you think you may need the thicker O'ring please search for our listing “B07XNJ89HW” Kinetic Wares supplies quality replacement parts for home water systems. O-Ring 6 pack is compatible with Compact Housing HBB-20, HBB-10, HBC-20, HBC-10, MWH-D, MWH-D-WELL, MWH-D20, MWH-D20-WELL, MWHSD, MWHSD-WELL, MWHSD20, MWHSD20-WELL, XWH-600, XWH-1000. Ace Hardware 49561; Ametek Kleen-Plus HD-10-R50, BBS; American Plumber W10-PR, 152014, W2010-PR, 152015, W15-PR, 152016, W2015-PR, 152017, WWHC, 152022; HD-950, HD-950A; 150237, 150239, 150469, BBFS-22, BBFS-222; HF45 Series Housings. Ace Hardware 4001756; 152032, W10-OR; Kleen-Plus 151122-03; OR-100, 151122-27, 01019189; 151122, BB BUNA-N. Just to name a few. 100% Satisfaction guarantee!