Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 151-003-D-111 IT 37 found under Valve Check by Beaird Industries Inc. The National Stock Number assigned to this part is 4820014415812, 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 151-003-D-111 IT 37.