The Res Caps from ResÖlution is a really smart kit with elastic lids made of high-quality silicone. Used to cover the openings on your bong or bubbler in order to be able to easily clean it with the "shake method" in which the paraphernalia is filled with a cleaning solution and then shaken until it's completely clean. Fits more or less all bongs. Can also be used to cover the openings when transporting, for instance when going on an adventure. No leaks, no smell. Kit contains two small and one large Res Cap.