Add a branch to supply tubing or dripline with the Smart Loc™ Multidiameter Tee, the unique fitting that accommodates multiple tubing sizes. Fits 16mm, 17mm, and 18mm supply tubing and dripline. To install, twist the nut toward the center of the fitting, insert the barbed end into tubing, then twist the nut over the tubing for a secure fit. Reusable fitting is made of ABS plastic treated with UV inhibitors to prevent fading and cracking.