Howe oil cooler tubes replace braided oil line to transfer heat into the surrounding air. Fin design increases the surface area 5 times over straight tubing. Aluminum conducts heat, while braided line is actually an insulator. The outside diameter is 1.75‚Äù diameter allowing it to be bent in a standard tubing bender. Inside diameter is sized for 3/4‚Äù Pipe thread. May adapt to #10, #12 or #16 oil lines. Sold in pre-threaded and chamfered lengths or in bulk up to 9‚Äô.