New Genuine Excel Water Pump Kit P/N 681806E includes O-Ring(as pictured). NOTE: There are a few options for water pumps with the DD15. Alternative and other replacement reference part numbers. Detroit Diesel EA4722000401, A4722001001, A4722000401. Detroit Diesel Series DD15 Water Pump. Excel p/n 681806E is #1 in the above diagram. If you have any doubt […]