... Height 50 mm Rated Working Pressure 63Mpa Fire Extinguishing Wedge Jacks, GYKF210/50-A Mini size rescue equipment, used for initial ... rescue of victims in the collapsed buildings, can use Wedge Jacks doing slotting work to open a rescue channel, in order ... , improve the rescue efficiency4. System uses German seals, aviation hydraulic oil, can be working at -30°C~ 55°C environmental temperatures ...