Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RP1906B found under Hose Nonmetallic by Marsh Stencil Machine Co. The National Stock Number assigned to this part is 4720011823458, 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 RP1906B.