Review on 💧 3.5" O.D. Black O-Ring Set for Reverse Osmosis Water Filter Housings (3 Pcs) by Jon Garcia

These o-rings fit snugly into the Krystal Pure KR-15 RO canister's seal grooves and effectively stop the drip stain we found from an old canister o-ring after completing our last filter change. I recommend using a food-grade silicone sealant to get a good water seal (my research has shown that you shouldn't use a petroleum-based product like petroleum jelly, which will break down rubber over time). It takes very little to complete the sealing. This is supposed to make the next filter change easier.