These O-rings fit well into the Krystal Pure KR-15 RO canister seal grooves, effectively stopping a drip leak we found through one old canister O-ring after completing our last filter change.I recommend using a food-grade silicone sealant to create a good water seal (my research found you should not use a petroleum-based product like Vaseline, which degrades rubber over time), very little is needed to complete the seal. Reportedly, this will also help make your next filter change easier.
Rating: [5 of 5 Stars!]