Rain Bird BT25-100 Drip Irrigation Universal 1/4 in. Barbed Tee Fitting, Fits All Sizes of 1/4 in. Drip Tubing, 100-Pack. This barbed Tee fitting quickly connects three pieces of 1/4 in. drip irrigation tubing in a T shape or taps into the side of 1/2 in. or larger Drip irrigation tubing. Accepts all sizes of 1/4 in. Drip tubing and provides a durable, leak-tight connection. Unique barb design reduces insertion force and natural color blends with all earth tones. To extend water flow to individual plants - connect 1/4 in. Drip tubing to one end and insert self-piercing barbed end into 1/2 in. diameter or larger Drip tubing. May be used above or below ground. Simple to insert by hand or use one of Rain Bird's insertion tools for faster installation in larger projects.