Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PD4-31-0190 found under Valve Regulating Fl by Bosch Rexroth Corporation. The National Stock Number assigned to this part is 4820013413809, 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 PD4-31-0190.