Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56691-001 found under Cock Shutoff Screw Stem by Vermeer Equipment Uk Ltd. The National Stock Number assigned to this part is 4820008656946, 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 56691-001.