3&rdquo; X 12&rdquo; (1&rsquo;) Long Silicone Hose Straight Turbo Coupler Tube Black New Brand new hose, Highest quality, Free expedited shipping, Hassle-free return. Hose Length: 12"; Wall Thickness: 5mm Hose Inside Diameter: 3; Hose Outside Diameter: 3.2 4 layer polyester reinforced High temperature silicone hose. Temperature Range: - 65F to + 350F.