Video - Apollo 1500/1550/1551 (816) Linear Actuator Swing Gate Operator February 28, 2020 22:59 Updated Related articles Apollo 816 Linear Actuator Installation Reference Manual 816 actuator limit assembly tower replacement instructions How do I get my 816 extension tube back to factory position? Invalid Radio Channels/Remotes on a 1050 Control Board. CBOX1050 Installation and Programming Manual