2-1/8" ID. Length: 6". Max Temperature Rating: 350F. Color: Blue. HPS High Temp 4-ply Reinforced Silicone Coupler T Hose Adapter is ideal for heavy duty pressure connections and provides excellent resistance for high temperature applications; The tee design is great for custom DIY fabrication project such as adding heater coolant line or blow off valve to intake or radiator cooling system.