Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D791-1255 found under Valve Safety Relief by Gas Equipment Engineering. The National Stock Number assigned to this part is 4820011355546, 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 D791-1255.