Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16418 PIECE 2 found under Seat Valve by Hyde Corp. The National Stock Number assigned to this part is 4820012085107, 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 16418 PIECE 2.