J 75 11 L5 Liftmaster Garage Door Opener-Installation Instructions-Connecting chain and sprocket (fits over your 1" garage door shaft). *Purchase your safety equipment and accessories separately. CPS-L photo protective beams, 658202 or 658302 Pneumatic safety edge kits. Transmitters 371LM, 372LM, 373LM or 333LM. Keypad 377LM. Always use a additional safety device when operating your door from a remote control transmitter or when your garage door is operated from a push button that is momentary contact close.Transmitters, keypads and safety equipment sold separately on site.