Hand retractable plungers are used when a swift and straightforward seal is necessary. Upon pushing the plunger, the ball disengages, effectively sealing the opening. Ring plungers operate similarly, creating a tight seal when the ring disengages and blocks the opening. Conversely, a spring-loaded plunger comes with a spring that compresses when the plunger is engaged. This type of plunger is suited for situations where continuous force is necessary to maintain an opening sealed.