Part Number XM4121 3 8S2 640 having (CAGE Code 86768) and FSC 4820 Valves Nonpowered in stock with ready to ship. Get an instant quote for XM4121 3 8S2 640 Valve Check by Teledyne Inc Teledyne Components. 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.