Floor spring for single leaf doors up to 1100 mm leaf width with or without mechanical hold-open function.  Closing force with variable adjustment from EN1-4.  Can be used for right and left hand doors without conversion.  Closing speed can be individually adjusted.  Hydraulic latching action which accelerates the door shortly before the closed position.  Integrated back check, slows down doors that are thrown open forcefully.  All functions can be adjusted from above and in the installed state.