Stick it to the cold with the Marina Suction Cups for Heaters - 2 pk. in your tank. These small but powerful suckers are perfect for glass or acrylic surfaces. Amazing adhesion that works in or out of the water, these babies will keep it all in place. About Marina Dedicated to providing a wide variety of friendly and affordable aquarium products for all types of fish keeping, Marina’s extensive product line has something for every fish hobbyist. Newbies love the ease and convenience of Marina’s fish starter kits, and those with experience appreciate the reliable efficiency of their filters and heaters. A varied selection of colorful, creative decorations such as gravel, plants, and ornaments, provide a gorgeous underwater environment. A vast array of maintenance and breeding accessories are practical, reliable, and timesaving so you can spend more time enjoying your aquarium and less time cleaning it. * For aquarium heaters up to .75 diam. inches * Medium size suction cups in black * Includes 2 suction cups * Provides excellent adhesion in or out of the water * Can be used on glass or acrylic surfaces