Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL4141 ITEM 27 found under Guide Valve Stem by W And O Supply Inc. The National Stock Number assigned to this part is 4820011801096, 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 PL4141 ITEM 27.