Included with the stainless steel u-bend tubing connector are 4 suction cups to hold everything in place.Stainless steel is not as breakable as glass, and will ensure your CO2 tubing will stay neatly in place without crimping and impeding flow. The u-bend comes In 3 different sizes, so make sure you are getting the one that fits your aquarium:
Small : For aquarium with 1cm thick glass
Medium : For aquarium with 1.5cm thick glass
Large : For aquarium with 2cm thick glass
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