Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PMF100321 found under Cap Valve by Sealing Devices Inc. The National Stock Number assigned to this part is 4820016462729, 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 PMF100321.