Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 25000540 found under Valve Pressure Equalizing Gaseou by Becklin Holdings Inc. The National Stock Number assigned to this part is 4820002228827, 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 25000540.