Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4031723 found under Adapter Swivel Flange Tube by Lewis Machine Llc. The National Stock Number assigned to this part is 4730003650297, 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 4031723.