Tubing 1/2In Blank Tube 50' 1/2'' distribution blank tubing for drip irrigation. 13mm OD. Connect with Rain Bird 1/2'' barbed fittings or compression fittings. Makes watering pots and container gardens easy. 1/4'' tubing size. Clog resistance through built-in filtration and two outl et holes, 180 degrees apart. Works with Rain Bird 1/4'' barbed fittings.