Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1.50IN 4C2236TT IT18 found under Ring Valve Piston by Portland Valve Llc. The National Stock Number assigned to this part is 4820014469818, 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 1.50IN 4C2236TT IT18.