Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21500G20 found under Adapter Straight Pipe To Gas Fit by Wilcox Industries Corp. The National Stock Number assigned to this part is 4730016189549, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21500G20.