Create a leakproof compression adapter when you solvent weld this PVC Compression Ring into a 1/2 in. PVC slip fitting (sold separately). Once attached, the slip and compression ring transitions 1/2 in. pipe to 700 Series supply tubing or dripline (0.680 in. to 0.704 in. OD). Tubing is inserted into the black compression ring, where an internal barb compresses the tube and holds it in place. Compression ring is made of PVC and treated with UV inhibitors to prevent fading and cracking.