Anybody can hang a door closer in a lab and cycle it to failure, but at LCN we go the extra mile to make sure our closers are built to handle the real world abuse, and punishment, that they're faced with everyday. The door closer is the heart of the opening, and that door closer needs to withstand heavy abuse to make sure the opening is functioning safely and securely. This video exposes what abuse can do to the internal components of a door closer, and how the 4040XP is built with the strength, and durability, to withstand just about anything. Video from Relcross