4" ID to 3.63" ID Coupler - Gloss BlackThis 4 inch to 3 5 8 inch reducing silicone coupler is 3 inches long. Four ply poly reinforced silicone. Perfect for air to air aftercooler systems and turbocharger supercharger connections. Fits on some LS1 MAF's. Rated at 350 F continuous. Recommended clamps are 94100 0400 for the 3 5 8" end and 94100 0438 for the 4" end.
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