High quality solenoid valve from M&M in modular design Thus you have yet wider range of valves & primarily in coils, which are now offered in all major operating voltages, such as 12 V DC, 24 V / DC, 24 V / AC & 230 V / AC. Another advantage of the modular design is that defective coils easily be bought as replacement & can be easily exchanged. Thus an expensive removal & installation of the valve is not necessary anymore