Part Number MC21237 having (CAGE Code 76050) and FSC 4820 Valves Nonpowered in stock with ready to ship. Get an instant quote for MC21237 Valve Stop Check by Eaton Aerospace Llc M C Aerospac. 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.