FEATURES: • U.L. & C.-U.-L. Listed • 5 Year Guarantee • High Strength Pressure Cast Aluminum Housing • Full Rack & Pinion Mechanism • Heat Treated High Tensile One Piece Piston and Spindle • Two Separate Speed Regulating Valves to Control Closing and Latching Speed • Reversible for both right and left hand doors • Leak Proof "O"-Rings Oil Seal • Adjustable Arm for all Models "A" Arm supplied standard, complete w/optional parallel arm bracket