Connect tubing around corners using the 17mm Insert Barb Elbow. This fitting allows you to incorporate a 90° turn in your 17mm supply line. The sturdy fitting connects two sections of 17mm supply tubing or 17mm dripline. The insert barb elbow fits into the end of tubing and anchors in place. This insert fitting is made of acetal treated with UV inhibitors to prevent fading and cracking.