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When it's time to make a connection, make it a positive one with DIG compression fittings. All DIG compression fittings are made of high impact material to ensure a positive connection and a long life. Assembled utilizing spin weld technology, the ABS bodies are assembled with a polycarbonate insert welded into place. Available in .450, .620, .700 and .710, DIG fits all 16 mm, 17 mm and 1/2" polyethylene tubing regardless of manufacturer.