HIGH QUALITY - Made of high quality PVC, it is non-toxic, eco-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 attach the heating rod and the water pipe. EASY TO USE - The suction cup is used for fixing. It is easy to use and requires no tools. Easy to install and remove. WIDE APPLICATION - For saltwater and freshwater aquariums, aquariums and all glass surfaces.