So I bought two packs of PGN 6304-2RS for my Pentair pool pump. After 5 months of operation, the front bearing collapsed. Can't pinpoint exactly how it failed, but the seal just separated at the rear and the bearing material broke inside. No moisture was found near the camp and nothing else disturbed the camp. I can't say all PGNs in pool pumps will fail as the other bearing is still in great condition. Maybe it's just a defect, but I'll try another manufacturer to see if it gets better. I don't think I bought from this seller, just FYI.