Using these Penn Plax Air - line Tubing Connectors is super easy. First, take the tubing you want to connect and simply insert the ends into the connectors. It's a quick and simple process. When using them, make sure the tubing is clean before inserting it into the connectors to ensure a good fit. As for maintenance, every once in a while, you can take the connectors out and rinse them with clean water to remove any debris. If you notice that the connectors aren't fitting as tightly as they used to, it might be time to replace them. And remember, since the colors can be either green or clear, you can mix and match them according to your fish tank's aesthetic.