I bought two of these less than a week ago to use in our Kohler sink. I installed them last night and they DO NOT HOLD WATER! I read the reviews AFTER I bought the drains and see where removing the o-ring will solve the problem. SADLY that doesn’t help!  I wish I hadn’t of thrown the packages away so I could return these overpriced, underperforming sink drains....VERY DISSATISFIED!!!