Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R55T2-DN25 found under Valve Quick Closing by Scandinavian Boiler Serviceinc. The National Stock Number assigned to this part is 4820222691779, 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 R55T2-DN25.