Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20A KK 44TT found under Valve Check by Flowserve Corporation. The National Stock Number assigned to this part is 4820997663952, 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 20A KK 44TT.