Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LPD 28 2.00IN NO 3 found under Seatvalve by William E Williams Valve Corp. The National Stock Number assigned to this part is 4820016814444, 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 LPD 28 2.00IN NO 3.