1533554 Irrigation dripper units G ECKSTEIN 29 Oct 1975 44758/75 Heading AID [Also in Divisions B2 B3 and B5] Cylinders 2 spaced at intervals in piping 1 provide dripper units for reducing the pressure of irrigation water which flows in the piping interior and thence through inlets 4 of the cylinders, along continuous grooves 3 and through outlets 5. Each groove 3 preferably has a spiral or labyrinth path. An extrusion nozzle head is adapted to allow the cylinders 2 to be placed in the piping during the extrusion thereof.
