The TWA Group thermal actuator is used with Danfoss small saddle valves and underfloor heating manifolds. The actuators can be used with all electromechanical or electronic room thermostats to control independent circuits or zones. TWA actuators are available for various valve types and connections in the NO (normally open) or NC (normally closed) version. ABN-F actuators are used with underfloor heating collectors from other manufacturers. Produced in NO (normally open) or NC (normally closed) versions. In addition, adapters for connection to the collector are required. You will find the required adapters HERE.