Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R42A04-50 found under Parts Kit Globe Val by Kerotest Manufacturing Corp. The National Stock Number assigned to this part is 4820012366019, 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 R42A04-50.