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HPS Performance Products HPS 3/4" - 1-3/8", Silicone Straight Reducer Coupler Hose, High Temp 4-ply Reinforced, 19mm - 35mm Carbon Offroad USA After testing different types ofHPS 3 4" 1 3 8" (19mm 35mm), High Temp 4 ply Reinforced Silicone Reducer Coupler Hose meet and exceed SAEJ20 industry standards, ideal for heavy duty pressure connections and provides excellent resistance for high temperature applications. HPS Performance silicone reducer coupler hose is designed and engineerd to meet high performance requirements specified in various industry standards, therefore make it great for marine and industrial use, custom