The 4840 Auto Equalizer is LCN's pneumatically powered multi-door solution. This low-energy automatic operator provides easy access for people with disabilities, or the elderly. Designed primarily for manual opening applications that occasionally require automatic opening. Pneumatic transfer hinge only for 4840 door operator. Transfers pressurized air via pneumatic tubing from frame to door leaf for fully concealed installations. Preparation of a raceway is required from the hinge stile of the door to the top rail for concealment of the pneumatic tubing within the door leaf.