Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R3156-3PC2 found under Seat Valve by Ruggles Klingemann Mfg Co. The National Stock Number assigned to this part is 4820000362305, 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 R3156-3PC2.