Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VC500-16SS 16IN found under Valve Check by Haywardindl Products Inc. The National Stock Number assigned to this part is 4820012756875, 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 VC500-16SS 16IN.