Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number J20R1-4.0IN found under Hose Nonmetallic by Sae International. The National Stock Number assigned to this part is 4720002889761, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like J20R1-4.0IN.