plastic melt output chamber 52 also comprises individual longitudinal channels arranged in its longitudinal alignment so that space 52 can extend over the entire height of support pipe 30 while admission chamber 50 as seen in the direction of viewing in fig1 is tapered conically from the top downward output chamber 52 is widened conically from the top downward this tapering leads to optimum flow behaviors with the flowthrough of filter element 18 with simultaneous depletion of the dead space distributor head 42 works in the traditional manner together with a control head 54 the control head is guided longitudinally movably in housing 12 along its interior wall with increasing setting movement in the direction of distributor head 42 the control head undertakes a side edge sealing 56 in relation to housing 12 for the feed of the plastic melt on pressure plate 44 control head 54 has a midline recess 58 the plastic melt is distributed from recess 58 outward uniformly over the top of pressure plate 44 passing through a peripheral longitudinal channel guide 60 the plastic melt passes from the channel guide out into admission chamber 50 control head 54 as compared with distributor head 42 is supported over a springy elastic spacing holder 62 as a sort of a partial segment of a plate spring such a space holder can be supported correspondingly with its bottom end in turn on a border flange of support installation 46 or on distributor head 42 in order to limit the path of control head 54 with the setting movement of control head 54 from its right non operational position into the left.