Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2257 found under Slidedirectional Control Linear by Puritan Bennett Corp Of California. The National Stock Number assigned to this part is 4820004031471, 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 2257.