Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B12-254P-2TS W 1 2 IN BY-PASS found under Valve Gate by Velan Valve Corporation. The National Stock Number assigned to this part is 4820011129798, 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 B12-254P-2TS W 1 2 IN BY-PASS.