To avoid water leakage: 1) check the spring inside the nozzle to make sure it was in right position before use;2) please fill up the dog water bottle as full as possible to let the air out and the ball bulges in the nozzle; 3) Please screw the nozzle off to check if residue goes inside and let the air in leading to water leakage;4) Clean and check the nozzle at regular intervalsThis pet water bottle works for small animals like bunny, puppies, etc.No screw needed, this water bottle is easy to install and adjust the installation height.Recommend to hang the bottle outside the cage so that pets cannot bite itCapacity (ml): 350 (12 oz).Package includes: Rabbit Drinking Bottle x 1 (Other accessories are not included).ProduktbeschreibungCheck the Rolling BallSlightly roll the nozzle ball to check if it was in right position before use. Please fill up the dog water bottle as full as possible to let the air out and the ball bulges in the nozzleCheck and clean the residue in the nozzle at regular intervals to avoid water leakage caused by blocking.