The choice and variety of radiator thermostat valve bodies available from Danfoss allows the specifier and installer to choose the right valve for the job. For use in commercial 2 pipe systems using steel pipe. RA-FN valves are available in 3/8", ½", ¾" and 1" sizes in angled and straight pattern versions. RA-FN valves can be used with all RA2000, RAS-D2 and RAS-C2 sensors, although valve capacity is reduced if RAS-C2 or RAS-D2 sensors are used. If pre-setting is required, RA-N valves should be specified, otherwise radiators must be balanced using conventional lockshield valves.