Rain Bird 1/4 in. Barbed Drip Couplings are used to connect 1/4" Distribution Tubing (XQ) in different configurations or attach 1/4" tubing to 1/2" or 3/4" tubing. Newly designed connectors have self-piercing barbs that easily puncture 1/2" or 3/4" tubing. Stem on fittings allows simple, quick installation using Xeriman™ Tool. Rugged plastic construction.