Direct Info from Product Website : https://www.co2art.eu/products/pro-series-12v-dc-solenoid-coil-replacement-safe-low-power-cool-touch

Pro-Series 12V DC Solenoid Coil Replacement.

High-quality solenoid valve coil used in all Pro-Series CO2Art regulators. Also compatible with most old CO2Art regulators.

Main solenoid coil features :

• Low & safe 12V DC input power
• Compatible with Universal 12V Power Adapter
• The coil doesn’t produce heat due to low power operation
• DC power prevents the solenoid from making buzzing sound during the operation which may happen with AC powered solenoids