Surface Applied Door Closer and Coordinator System The TS93 GSR combines exceptionally smooth, efficient door control with proper sequential closing for pairs of doors equipped with astragals or exit devices. The GSR Series provides function which ordinarily requires two or more hardware components. Highly efficient coordinator Smooth, efficient door control Sequential closing for pairs of doors Non-handed design Easy installation, quiet operation Product Details Smoother and easier door opening Twin TS93 closers feature DORMA's unique cam and roller mechanism which makes door opening both smoother and easier than is possible with traditional rack and pinion closers. Highly efficient coordinator A highly efficient GSR coordinator housed in the track unit provides dependable sequential closing of doors. The TS9315 closers comply with barrier-free requirements.