Replace the old and worn down suction cups timely. Made of safe plastic but will turn milky white after a while of use in water. Fit for 3/16" ID or 1/4" OD Standard aquarium airline tubing or CO2 Tubing. Soft clear plastic sucker is easy to install and uninstall on fish tank, aquarium and any other clean and dry glass surface. Each suction come with one release clip. You can easily adjust shape and position of tubing. Package Content: 20 x Aquarium suction cups.
