The Nakadapt Rustoleum Adapter allows male valved Rustoleum brand spray paint cans and other similar sized male valve cans to work with male caps, such as Astro Fats, Pink Dots, NY Fats, German thins, and all other euro sized caps. Most caps fit on the adapter. It works well with the larger stemmed Rusto Fats, NY Thins, and Boston Thins/Fats - however, you just have to firmly put the cap in the adapter before putting it on the can. The adapter is a single piece of hard plastic, so there is no gasket to fall apart like some other adapters. It also has a unique lip that makes it easier to change cans. It can also be used alone as a splatter cap.