Create a watertight connection in your 1/2 in. distribution line using the 1/2 in. Compression Coupling. The coupler is used to connect two sections of 1/2 in. supply tubing or dripline together. No need to stretch the tubing end over the fitting barb-with the compression fitting, simply insert the tubing end inside the compression ring, where an internal barb compresses into the tube to hold it in place. Made for durability, the compression fitting is made of acrylonitrile butadiene styrene (ABS) treated with UV inhibitors to prevent cracking.