Bubbler??? I am thinking of the bubblers that I use in the minnow bucket that forces air down the plastic tube through a pouris rock. Or the bubblers that they use at permanent docks on lakes like Minnetonka, WBL, Prior lake, etc. Is it the same principle on a decoy????
Or are you talking splashers? EG Wonderducks? https://www.youtube.com/watch?v=yzQOCH1aGUk