Blue 2.5" Rubber Coupler hose for shortram cold air intake kit cool ram Great for using with DIY custom air intakes. This kit includes 1 x Rubber Coupler. Hose Inside Diameter: 2.5" ( 63mm ). Fits on pipe or tubing with 2.5" outside diameter. Hose Length: 3" (76mm) Material: Rubber. Color: Blue Since the rubber hose is made with rubber and is NOT reinforced; it is NOT recommend to be used in high boost or high temp application