Rain Bird BC50/5PK Drip Irrigation 1/2" Barbed Coupling Fitting, 5-Pack x 5 Non-obtrusive colored fittings to complement natural earth tones 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