Thermostatic head with built-in sensor for direct connection onto TA M28X1.5 thermostatic radiator valves. DIVELLO ECONOM™: Radiator-independent and energy efficient original product. DIVELLO LIQUID H-TECH™: Liquid-filled sensor element with high closing power – ensures stable and accurate temperature control and trouble-free use. Internal Blocking: Makes it difficult and even impossible to manipulate the min and max temperature. Anti-Theft: Theft proof – can be locked with hex key (2 mm) which obstructs disassembly. Solid Design: Solid and robust construction which is easy to keep clean.