Fits for Gott / Rubbermaid Plastic Can. (These do not work with Chilton / Sears Craftsman cans). Easy to install,drill required.Start with an empty can, Drill 1/2" hole at the back of your plastic can above the fill line, insert vent cap and pop it in gently with a rubber suggest you drill a smaller hole to start with and work your way up to the 0.3" drill bit.
