These connectors are very useful for items from the Por Amor range as they allow the products to connect and be compatible with each other. For the DIYer these are a great customisation tool.
You can build very simple ideas or as complicated as you want, for example, combine an out world with a conical adapter and a test tube, add a grout insert, and you get a very good starting set-up at a very decent price… or make a test tube array using Ts, adding one at a time slowly until the size of the colony justifies a bigger formicarium, you get the idea, etc. Being able to have connectivity between test tubes and different vinyl tubing is one of the easiest ways to slowly expand your colonies.
L, T and X connectors shape and expand the direction you want to go.