JMTurbo Blue 3" - 4" Silicone Hose Straight Reducer Coupler Hose Length: 3"; Wall Thickness: 5mm Hose Inside Diameter: 3"-4"; Hose Outside Diameter: 3.2  4.2 4 layer polyester reinforced High temperature silicone hose Temperature Range: - 65F to + 350F Brand new, only one hose per order