Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1720X36TP found under Valve Check by T P Pump And Pipe Company. The National Stock Number assigned to this part is 4820016018646, 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 1720X36TP.