Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B8 1 2IN BRS 12PSI SET found under Valve Regulating Fl by Itt Bell And Gosset Hydronics. The National Stock Number assigned to this part is 4820012691589, 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 B8 1 2IN BRS 12PSI SET.