Add a 90° corner in your irrigation system using the Compression Elbow 600 Series. This El fitting connects two sections of supply tubing or dripline (0.610 in. to 0.640 in. OD) together at an angle to prevent kinking. Tubing is inserted into the compression ring, where an internal barb compresses the tube and holds it in place. compression fitting is made of ABS plastic treated with UV inhibitors to prevent fading and cracking. Use fittings to set up a new drip irrigation system, expand an existing system, or make repairs.