The High Pressure Safety Device Assembly provides a positive seal between the system and atmosphere and facilitates an indicating device to be fitted. The product has a maximum working pressure of 130 Barg. There are 2 versions of the High Pressure Safety Device Assembly: single and dual. The single Safety Device Assembly comprises of a pressure relief valve, rupture disc and a pressure indicator gauge. The dual Safety Device Assembly comprises two pressure relief valves, two rupture discs, two pressure indicating gauges and a three-way dual shut-off valve.