548 Radio Frequency Transmitter, Norton Door Controls, Mfr#: 548

Norton Door Controls offers a comprehensive line of door controls designed and manufactured to ensure superior performance and reliability. Norton Door Controls refined the rack and pinion closer and the concept of valve controlled backcheck for hydraulic door closers. Along the way there have been a variety of other innovations, including aluminum alloy body, narrow style, non-handed closers, adjustable backcheck, speed adjustments and special application arms.