Door Closer,Panic Device suit for door weight 25-145kgs 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, ...