US Lock U014870 1740 Size: 3 with Backcheck Duronotic Door Closer Durondic Finish

Adopting top quality Aluminum alloy raw material, under the advanced technology of Die-Casting. High-tensile Spring, oil- tempered steel, supply enough power to close the door. Each model could be installed by Top Jamb, Standard, or Parallel arm installation by parallel arm bracket is option. Surface applied with hydraulic backcheck and adjustable 50% increase in closing force for draft or pressure conditions Aluminum body and zinc plated arm assembly Rack and pinion mechanism 3 separate valves independently adjusts sweep and latch speeds and backcheck</li