dimension 1/2, with thread M 30 x 1.5 for “H”-heads, central or lateral radiator connection from below, with flat seal, pipe centre distance 50 mm. With submerged pipe L=290 mm, Ø=11 mm. The radiator can be removed while the system is under pressure. The valve upper part can be changed by means of HERZ-Changefix “H” Tool. Pipe connections G 3/4 with cone. Pipe connections have to be ordered separately.