US Patent- Patented leak-proof nozzle (nozzle diameter:16mm) not recommend for guinea pigs
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.