The WingCap lets you use your favorite caps on your local hardware paint brands, like Rustoleum, American Accent and Painters Touch. This adaptor cap is for use on cans with a "male" valve system, with a "male" cap. This adapter will bridge the gap between the caps you love to use and many paint lines that have switched to male valve systems. Simply place this adapter over the valve system and insert your favorite male caps. Easy on the fingers with the Wings, reusable many times, this is a must have tool for all writers. BONUS USE: try your WingCap WITHOUT any tips, simply by pressing down the Wings... surprise, surprise!