LASCO 15-5326P 1/2-Inch 620 OD Drip Tubing Adapter, Mainline Tubing by Female Garden Hose Thread Swivel 1/2-Inch .620-Inch tubing by female hose thread Green ring indicates .620 fitting Works on all railbird mainline tubing Recommended operating pressure 10 to 30-PSI Maximum operation pressure 60-PSI