Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 75-7550-225 found under Valve Vacuum Breaking by Adamation Inc. The National Stock Number assigned to this part is 4820010172674, 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 75-7550-225.