https://www.jpcorry.com/jp-corry-products/centurion-door-closer-concealed-pb/
Centurion Door Closer Concealed Pb
Description
Centurion Door Closer Concealed Pb-These concealed jamb door closers are a effecient method of closing a fire door. Mainly recommended for internal doors they are fitted into the door edge, with the chain plate attached to the frame. When the door is opened, the spring recoils and forces the door to shut.