Safety group G 3/4 for electric and combination storage tanks up to 1000 litres capacity. With safety valve 0.6 MPa (6 bar) as standard for storage tanks with a permissible operating pressure of 0.6 MPa (6 bar). Enclosed replacement cartridge for diaphragm safety valve with 1.0 MPa (10 bar). Equipped as standard in accordance with DIN 1988 with shut-off valve, backflow preventer with test device (2nd shut-off valves), pressure gauge connection, diaphragm safety valve and drain funnel. A pipe interrupter is integrated in the drain funnel of the safety valve, which prevents the drain water from being sucked back. The safety valve can be rotated and replaced using a screw connection to adapt to different installation conditions. The safety group can be installed as a corner or straight-through shape in horizontal and vertical lines. In vertical lines, the safety group may only be installed in the flow direction from bottom to top.