Choco Nose H220 Patented No Drip Top-Fill Small-Sized Dog Water Bottle, Cat Water Feeder with Hook, Pet Water Dispenser, Water Bottle 13.5 Oz. Nozzle Diameter: 16mm US Patent- Patented leak-proof nozzle (nozzle diameter:16mm)/ Do drip pet water bottle/ Recommend for Small-sized Dog/ Medium size Rabbit/ Not recommend for guinea pigs User friendly Screw-on bracket: Insert the drinking tube through the wire cage side or crate door, add the screw-tight bracket by checking position of the bracket's snap-fit attachment, and tighten the screw fitting from inside the cage. Then you can easily snap the water feeder on or off for cleaning and refilling. Hang-on bracket Snap the hook bracket in one of the top 2 grooves in the bottle. Hang the bracket over the appropriate cross wire. The screw on bracket may be added for extra security. Easy to fill water from the top/ 13.5 oz capacity Easy to adjust the height of the water bottle