I first thought the leak came from the pump assembly rear o ring. I was wrong. The water was leaking from the pump. The pump assembly was shipped in 1 1/2 days with 2 more o rings. I lubed the o rings with dish soap, they slid in perfectly. reinstalled the clamp and screws and was ready to reinstall the dishwasher. Worked great. Next time I will buy the pump the first time. Buying the o rings separately adds $$.