Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WC333 1 50 28 4 found under Hose Air Duct by Arrowhead Products Corporation. The National Stock Number assigned to this part is 4720014918955, 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 WC333 1 50 28 4.