This is a high quality, fully transparent connector in a T-shape.
You can link three housing products, f.e. a test tube, an ant farm and an arena easily together. Give your ants a lot of possibilities. In nature they also use a lot of different corridors and chambers. So it is good to give them several transport routes with this connection piece.
The T-connector has an inner diameter of a bit less than 10 mm. So you can attach a hose with 10 mm outer diameter. This T Couple piece is a ultimate combination with our transparent 8/10 mm tubing