HPS High Temp 4-ply Reinforced 2-1/2" ID x 3" Long Silicone OffSet Coupler Hose Black (63mm ID x 76mm Length) Hose Inside Diameter: 2 1/2" (63mm). Length: 3". Distance between two centers: 1/2". 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.