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The 4040XP is LCNs most durable and flexible heavy duty closer designed for institutional and other demanding high traffic applications. Featuring a cast iron body forged steel arm double heat treated steel pinion and all weather fluid. The non-sized cylinder is adjustable for interior doors to 50 and exterior doors to 40. Closers meet ADA requirements are UL and cUL listed for self-closing doors without hold open and are tested and certified under ANSI Standard A156.4 Grade 1.