The Plunger is an Inventory Item that can be used in the game.
The Plunger is like an old-fashioned hand plunger tool used for unblocking sinks. It has a large rubber suction-cup and a short wooden handle.
The Plunger can be found stuck to the ceiling in the middle prison cell.
Josef can simply extend himself taller and reach up to pull the Plunger off the ceiling.
The Plunger can be used as ammunition for the Plunger Gun, similar to the suction-dart used in a toy gun.