Spectre's 4 inch Collar Clamp is designed to connect 4 inch air intake components together. Spectre's collar clamps, couplers, and tubes allow you to design and build your very own custom cold air intake. Measuring 1-3/4 inches wide and featuring polished stainless steel construction, this band style t-clamp covers a PVC boot to join and seal the junction of the intake tubes. Each package contains one clamp.