HIGH QUALITY - Made of high quality PVC, it is non-toxic, environmentally friendly, strong and durable. SIZE - The pipe suction cups can accommodate 23mm (outer diameter) pipes. /p> ADVANTAGE - With the aquarium suction cup, you can effectively fix the heating rod and water pipe. EASY TO USE - The suction cup is used for fixing. It is easy to use and does not require any tools. Easy to install and remove. WIDE APPLICATION - For saltwater and freshwater aquariums, fish tanks and all glass surfaces.