Part Number 304 90 having (CAGE Code 10391) and FSC 2805 Gasoline Reciprocating Engines, Except Aircraft; and Components in stock with ready to ship. Get an instant quote for 304 90 Washer Valve Keeper by Clinton Engines Corp. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.