This adapter allows electronic valve drives with M30 x 1.5 mm connection threads to be mounted on heating valves with M28 x 1.5 mm connection threads ,- The adapter is suitable for nearly all standard radiator valves with a connection thread of M28 x 1.5 mm ,- The following companies produce radiator valves with these dimensions: Herz, MMA, Remagg, TA, Comap, Markaryds, SAN, Slovarm ,- Simply screw on to mount - no special tools are required ,- The adapter can be used for the following Xavax articles: 00111971, 00111972, 00111850, 00111923 , ,Note for Consumers: ,When the old radiator thermostat is demounted, the valve on the radiator opens. In this case, the radiator and its connections possibly heat up strongly. If necessary, the heating system should be taken out of operation when the adapter is mounted or the radiator should be shut off on the lockshield valve