Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81PS1F68 8 140 found under Valve Safety Relief by Tyco Valves And Controls Lp. The National Stock Number assigned to this part is 4820016463619, 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 81PS1F68 8 140.