Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LR-012017 PC 5 found under Valve Check by R And M Energy Systems Tomball P. The National Stock Number assigned to this part is 4820012839601, 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 LR-012017 PC 5.