... (90/396/EEC EN1854) Italy MADAS SW Series of Air, Gas Pressure Switch is used in a variety of industrial and heating system ... under European standard EN1854 for gas, air, flue gas, etc. ... Connection: 1 and 2, Positive pressure control Rp1/4"; 3 and 4, Negative pressure control, RP1/8". Model Pressure Range Width ThicknessMW3-A4 0.4 ...