Garage Door 4 Less - LiftMaster Trolley Operators
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Low-Profile Apartment House Trolley Operator 

Model APT is a low-profile apartment house operator that features a resilient-mount motor, low-profile design, industrial ball bearings on the output shaft, and quiet-gliding rail spacers.
Heavy Industrial-Duty Trolley Operator 
Model GT is a heavy industrial-duty trolley operator for standard lift sectional doors.
Medium Duty Trolley Operator for Standard Lift Sectional Doors 

Model MT is a Medium-Duty Logic trolley operator for standard lift sectional doors. It features a high-starting torque motor, a compact design, quicket-gliding rail spacers and a quick-mount swivel header bracket.

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