1, Tee, elbow, end cap, bypass 2, Diameter: 16mm or 12mm Drip Tape fittingsDiameter: 16mm or 12mmUsed to connect the drip tape.Drip Tape fittings-TeeDiameter: 16mm Features and Specifications:It is used to connect lengths of 16mm Drip TapeReusable – Just unscrewQuick & Easy Installation & RemovalHigh Quality Plastic with Maximum UV Protection 12mm and 16mm Fittings