Diaphragm pressure switches with micro switch (silicone-free) for monitoring gas pressures on boilers, for positive pressure, for gas, also suitable for biologically produced methane, switching point set at factory, DG..VC with infinitely adjustable hand wheel to switch between natural gas and LPG, EC type-tested and certified pursuant to the Gas Appliances Directive (90/396/EEC) and the Low Voltage Directive (2006/95/EC) in conjunction with EN 1854.