By means of the H-piece valve type RLV-K, every valve radiator with a centre distance between the connections of 50 mm can be blocked individually, e.g. in order to carry out trouble-free maintenance without affecting other parts of the system. H-piece valve type RLV-K is nickel plated and is available in straight and angle versions. Special adapters ensure that the H-piece valve can be used both for radiators with an internal thread of G ½ and with an external thread of G ¾ A. All adapters are self-sealing. RLV-K can be shifted from two-pipe to one-pipe operation. The factory setting is for two-pipe operation. In one-pipe operation, the water flow to the radiator can be set infinitely variably. The shift to one-pipe operation is simply done by turning the bypass spindle. A fill and drain tap is available as an accessory to RLV-K. The fill and drain tap is only available without nickel plating.