Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8505PC19A found under Wrench Valve Seat by Tyco Valves And Controls Lp. The National Stock Number assigned to this part is 4820005882631, 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 8505PC19A.