500 series door closer

UL Listed,1 Million Cycles In Endurance Are Guaranteed, 5 Years Warrant.
Universal Application, Designed For All Standard Installation.
Power Size Range:1~5 In Various Coser Body.
Two Separte Valves For Close & Latch Speed Adjustment.
Optional Back Check Function.
Optional Built-In HOLD Open type:501D,502D,503D
High Quality Hydraulic Fluid, Low Freezing-point,Door Closer Operates Smoothly Form Temperature Of -30¡¦ To 40¡¦.Feature:
Dual Valve, Closting And Latching Speed Controlled By Two Separate Requlating Valves.
Universal Applicatin:Standard, Top-Jamb, Parallel Arm Installations.
Standard Packing no include Parallel Arm Bracket. The bracket be provided upon request.
Reionforced Type Adjustable Tube Arm.
Rack and Pinion Operation Contained in a High Tensile Precision Cast aluminum Housing For The Highest Quality.
High Quality Hydraulic Fluid for High Lubricity and Constant lubrication.
Optional Back Check (503BC,504BC,505BC), Controlled by Separate Regulating Value.
Finish Selection:Silver(Alum), Bronze(Duro),Gold. Any Other Finishes Is available Upon Request.Classification & Glossary
502:Size 2.
502D:Size2,Built in HOLD Open type
503BC:Size 3,Back Check.Optional Items:
C:Decorative P.V.C Cover for 502,503,504 type,Steel Cover for 502 type only.
P:Parallel Arm Bracket.
BC:Back Check