HPS High Temp 4-ply Reinforced 3" ID x 6" Long Silicone Coupler Hose Black (76mm ID x 152mm Length) Hose Inside Diameter: 3" (76mm). Length: 6" Color: Black. Wall Thickness: 5mm Max Temperating Rating: 350F. (177 degree Celsius) Reinforced Layer: 4-ply Polyester. Meet or exceed SAEJ20 standard, ideal for heavy duty extreme temperatures and high boost condition. Silicone hose is compatible with water or anti-freeze such as coolant. Silicone hose is NOT compatible with fuel or oil.