The 6-inch Tri-Clamp coil with a 1/2-inch dip tube is a 6 inch lid with 3 ports， the 2 outside ports are the input and ouput for fluid in the coils. the center port is a half inch diptube， the diptube allows to reach to the bottom of your tank. The coils are effective for cooling dow n the interior of your tanks. The coils have a 3/8' ID.
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