Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A25-0900 found under Valve Check by Sweeney Engineering Corp. The National Stock Number assigned to this part is 4820005282553, 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 A25-0900.