Marina Thermometer Suction Cup , Large, 2-Pack Suction cups are practical for securing thermometers or airline tubing to aquarium glass or acrylic surfaces It provide excellent adhesion in or out of the water Available in large size; includes 2 suction cups per blister card Measures 1-4/5-inch length by 2-8/9-inch width by 4-1/2-inch height This product weighs 0.03-pound