uxcell Plastic Aquarium 2 Way Air Line Fish Tank Tubing Elbow Connectors 10 Pcs White Healthy and non-toxic aquarium airline connectors are used for mending or extending air hose. Overall Size (Approx.) : 28 x 28 x 7mm / 1.1" x 1.1" x 0.28" (L*W*H);Tube Connector Dia (Approx.) : 5mm / 0.2" White plastic fish tank connector, they are made of good quality white plastic, non-toxic and durable. Connectors can combine two inputs together to create one output which are good with dual outlet pumps, convenient for you to use. These air tube connectors are use with standard aquarium tubing.