Wanted something to replenish my cats water bowl. This part holds the neck of a standard 500mL waterbottle and still allows you to put the cap on to either help control the rate of water flow or to help install it under a full water bowl and bottle at the same time. Holding the neck of the bottle helps to keep the plastic part out of the water.

The stl is upside down but can be flipped 180 degrees. I used a razor blade to splice the hoop and a heat gun to open and close it around the neck of the bottle.