Premium grade 7 ply 3/4” panels manufactured with a medium density overlay (MDO) laminated to smooth hardwood outer veneers of Transportation Core plywood all designed for optimum strength and appearance.
2" track and rollers for durability.
Tongue and groove joint.
2 cable balancer with independent spring for each cable. Springs treated with rust preventative.
May be used in two different ways; as an OPEN only control (all LiftMaster operators) or as an OPEN/CLOSE control (only LiftMaster operators with types B2 and S2 control wiring). In the latter case pulling the cord will open a fully closed door close a fully opened door and reverse a closing door.
Pulling the cord whlie the door is opening will either have no effect (type B2 wiring) or will stop the door (Solid State Logic Control Board).
WARNING: When used on most industrial operators this control will not stop the door. Use another control that has a STOP button in conjunction with this control.