Constructed of molded UV-resistant, high-impact plastic, DIG compression fittings provide a secure water-tight fit without the need for glue or cement. Utilizing spin-weld technology, the ABS bodies are assembled with a polycarbonate insert that's welded into place. With the many sizes of 1/2 in poly tubing, DIG provides compression reducing couplings so that whatever size of tubing is used can be integrated into the system.