Stepless presetting - Brass - Nickel-plated - Presetting is done by means of presetting key 1183962 or key SW 13 or Heimeier setting key - For two-pipe central heating systems with forced circulation - Not suitable for heating systems. Additional technical features: - Dimension thermostatic connection M30 x 1.5 - Version (1) with infinitely variable presetting - Version (1) end piece/female thread - Automatic flow control: No - Operation thermostatic with knob - Size radiator connection 1/2 inch (15) - Height 53mm - Kvs value 1.2 - Opposed flow direction: No - Thermostatic preparation: Yes - Shortened overall length: No - Pre-adjustable: Yes - Body material: Brass.