Small changes in elevation or even temperature can develop a vacuum lock on a cooler that makes it almost impossible to open. Maluna Unhinged coolers contain a patent-pending pressure regulator that maximizes the internal vacuum to -6 KPA and ensures that your Maluna can be easily opened.
Located behind the bottle opener, the pressure regulator contains a calibrated spring, a ball, and a rubber seat.
To check that the ball is seated properly:
Remove (unscrew) the bottle opener.
Locate the rubber seat which looks like a round plug with a pinhole in the center.
Gently push a pin or thin drill bit through the pinhole and feel for the ball inside.
The ball inside should move with pressure applied and push back against the seat.