Norton delivers a robust range of door closers engineered for exceptional durability and performance. The 8501689 model features a refined rack and pinion design with valve-controlled backcheck for smooth, controlled door operation. Constructed from cast aluminum with an aluminum finish, it includes adjustable backcheck, speed controls, and a full cover with sex nuts for secure installation. Certified to ANSI/BHMA A156.4 Grade 1 standards, this non-handed closer offers a lifetime of reliable service backed by a 25-year warranty, suitable for demanding commercial applications.