Part Number 491-5038-00 0 having (CAGE Code 58568) and FSC 4820 Valves Nonpowered in stock with ready to ship. Get an instant quote for 491-5038-00 0 Valve Assembly by Envirovac Inc. 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.