Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H 300USSLR1 4RS found under Valve Angle by Ham Let Usa Inc. The National Stock Number assigned to this part is 4820016209435, 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 H 300USSLR1 4RS.