HPS High Temp 4-ply Reinforced Silicone Straight Reducer Coupler Hose Black with 1.38" > 1.5" Inside Diameter and 4" Length meet or exceed SAEJ20 standard, ideal for heavy duty pressure connections in hostile engine environments, extreme temperatures and various pressure ranges where high performance levels are required. Technical Specification: Temperature Range:- 65 deg. F to + 350 deg. F (177 deg. C). Reinforced Layer: 4-ply polyester. Hose Inside Diameter: 1 3/8" > 1 1/2" (35mm > 38mm). Hose Outside Diameter: 1 3/4" > 1 7/8" (45mm > 48mm). Wall Thickness: 5mm. Hose Length: 4". Remark: Silicone hose is compatible with water or anti-freeze such as coolant. Silicone hose is NOT compatible with fuel or oil.