RAS-D2 Angle TRV complete with Chrome sensor and 8,10 & 15mm compression fitting and matching chrome lockshield valve. Unique flow selectable bi-directional valve The new RAS-D2 radiator thermostats are the latest addition to the Danfoss TRV range. They are designed for use in 2-pipe domestic heating systems like designer radiators or towel rails. The valves have a ½” BSP (R½”) tail piece connection to the radiator and include 8mm, 10mm and 15mm compression fittings to connect the valve to the pipe work. RAS-D2 sensors incorporate a “Frost Protection” setting and a “Positive Off” feature for maximum user flexibility. Temperature range is from 8°C to 28°C.