In-Ground Manual Swing Barrier Receiver PostExtremely effective and economical for unmanned traffic control. Secure the gate and prevent sagging of the barrier arm. Galvanized pipe for durability. Gate Safety and Security Post Safety Fits LiftMaster In Ground Swing Barrier Units. Required for use with LiftMaster Swing Barriers; recommended (2) for use with single arm gate to secure gate in open and close position, recommend (2) with dual gate arm to secure each gate in the open positions Safety