Function: 1. This automatic refill system can be easily installed on your aquarium catfish. 2. Float valve for manual adjustment, no other tools, no metal screws, no corrosion. 3. Comes with O-ring, can meet 16/12 water tube, does not leak. 4. Suitable for aquarium below ok. Thickness 15 mm / 0,59 in. The adjustable water level range is ok. 0,5-15 cm /0,2-5,9 inch . 5. The bracket is made of high quality material, stable and heavy enough, not easy to knock. Specification: The automatic refill system is easy to hang on the aquarium bowl, it can automatically fill and cut off the water supply. You make it fit many different positions and heights. Characteristics: 1. This automatic refill system is easy to install on your aquarium bowl. 2. Float valve for manual adjustment, no other tools, no metal screws, no corrosion. 3. Comes with O-ring, can meet 16/12 water tube, does not leak. 4. Suitable for aquariums less than 15mm thick. Adjustable water level range is 0,5-15 cm. 5. The bracket is made of high quality material, stable and heavy enough, not easy to knock. Specification: Item Type: Automatic Aquarium Water Controller Material: acrylic plastic Item Color: As shown in the pictures Float valve size: ok. 4 x 5,6 cm / 1,6 x 2,2 inches Package weight: ok. 66 gr The package includes: 1 * Water Filler 3* Akcesoria 1 * Bracket