For Standard Heaters: Each sucker is 1.3" in diameter with a 0.95" clip. Perfect for holding 1" standard aquarium heaters, PVC tubing or rain bars. Not Fit For Airline/Air Tubing! Strong Suction: Made of soft and flexible rubber material, the suction cups can stick tightly to your fish tank, aquarium or other glass surface for stable holding. Tough Plastic Clips: Each suction cup comes with a clip made of heavy duty plastic. Sturdy enough to firmly keep your aquarium heater in place. Detachable Design: Align the clip slot with the bulge of the sucker, snap it into the slot and turn it 90 to lock them. Then rotate the clip back and pull it out to remove it from the sucker base. Easy Maintenance: Just clean and dry both suction cups and glass surface before installation. Please replace them timely if they get old and worn after long-time use. Product description Pawfly specializes in all must-haves of aquarium accessories such as air pumps, air stones, sponge filters, fish nets, cleaning brushes and other accessories to set up your aquariums. Heater Suction Cups with Clips Pawfly aquarium heater suction cups with clips are ideal for holding 1" standard heaters. Made of reliable plastic and rubber material, they have strong adhesion to stay firmly either outside or inside the tank with water. The clips can be easily detached from the suction cups, and the 0.95" proper size can also nicely fit most standard PVC tubing or rain bars and keep them right in place. But not suitable for airline or air tubing. Clip diameter: 0.95" For 1" standard heaters Strong rubber suction cups Sturdy clips for stable holding Easy to install and detach Packed with 12 Pcs in total Directions For Use Apply to Dry Clean Glass! Your suction cups work best when placed onto clean and dry glass. They?ll turn white and lose ability to maintain suction after a period of time of use in water. You can wash them with dish soap or vinegar and rinse them thoroughly with warm water. Replace Your Suction Cups! The suction cups do wear out over time. Do not expect a suction cup to last forever. Most importantly, you need to replace the old and worn suction cups timely if they still can?t stick properly to dry and clean glass. Fit 1" Standard Heaters Diameter - 1.3" for the suckers and 0.95" for the clips. Great for 1" standard aquarium heaters, PVC tubing or rain bars. Not Fit Airline/Air Tubing! Hold Your Heater Stably Made of reliable plastic and rubber material, the sucker stays firmly on the glass and the hard clip secures your heater tightly to keep it in place. Easy to Use/Maintain Push the clip into the sucker and rotate it 90 to lock them. Keep the sucker and glass dry before use and replace the old and worn suckers in time.