The Rain Bird 1/2 in. Barbed Drip Coupling features easy push-together installation connects 2 pieces of 1/2" tubing. Works with 1/2" tubing (OD 0.63", ID 0.54"). High quality barbs grab tubing for a secure fit. Unique barb design to reduce insertion force and still retain a secure fit. Non-obtrusive colored fittings to complement natural earth tones.