A door closer piston is a mechanical device that controls the closing speed of a door. It is typically mounted on the top of the door frame and connected to the door by an arm. When the door is opened, the piston compresses, storing energy. When the door is released, the piston extends, releasing the energy and closing the door.
Door closer pistons are an important safety feature, as they help to prevent doors from slamming shut and causing injuries. They can also help to improve the energy efficiency of a building by reducing heat loss through open doors.
