Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B518JYT found under Valve Check by Henry Technologies Inc. The National Stock Number assigned to this part is 4820000909813, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B518JYT.