Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 023-00039 found under Valve Relief Pressu by Hdt Expeditionary Systems Inc. The National Stock Number assigned to this part is 4820015598781, 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 023-00039.