This no spill cap is made specifically for large bottles, 1 gallon up to 6 gallon in size - SELECT SIZE This helps disabled and elderly people easier to load your water bottle into your crock or electric dispenser Simple install the cap by screwing/snapping in (depending on your size) and turn the bottle upside down. This no spill cap is meant to be used to work with dispensers you have to carry the bottle over like crocks or electronic. Make sure you get the right size! Most returns are caused due to incorrect size purchased; if it screws its 48MM, if it snaps its 55MM