Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 300-629 ITEM 31 found under Tube Assembly by Biomarine Ntron Incorporated. The National Stock Number assigned to this part is 4710012336924, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 300-629 ITEM 31.