Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 32 4012 found under Valve Check by Dart Truck Co. The National Stock Number assigned to this part is 4820005418724, 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 32 4012.