Aquarium Fish Tank Plastic 3 Way Joints Connectors For 5mm Air Line Tubing by MECO Aquarium Airline Connectors for mending or extending standard airline hose They are made of plastic material for long time use Durable plastic construction, 3 way tee shape, easy and convenient to install Fit to use with 5mm aquarium air line tubing Color: White T-connectors allow you to combine two inputs to create one output. They are excellent for use with dual outlet pumps