Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 921 3 4IN 130T180 DEG F SBU found under Valve Regulating Te by Robertshaw Controls Company. The National Stock Number assigned to this part is 4820006400034, 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 921 3 4IN 130T180 DEG F SBU.