Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MOD 20M 3 4IPS SET50PSI 15GPM found under Valve Safety Relief by Anderson Greenwood Lp. The National Stock Number assigned to this part is 4820013191884, 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 MOD 20M 3 4IPS SET50PSI 15GPM.