Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 15B-300 LB NPT found under Valve Gate by Allen W D Mfg Co. The National Stock Number assigned to this part is 4820010315155, 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 15B-300 LB NPT.