Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 055-0010R000 found under Ball Valve Ported by Williams Fire And Hazard Control Inc. The National Stock Number assigned to this part is 4210015935460, and the Federal Supply Class is 4210 Firefighting Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 055-0010R000.