Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20B-5780 found under Valve Calibrated Fl by Snap Tite Inc. The National Stock Number assigned to this part is 4820013318269, 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 20B-5780.