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Claim 1

IN A CARBONATING TANK OF THE CHARACTER DESCRIBED, A NOZZLE BLOCK, A CENTRAL VERTICAL, LIQUID-DELIVERING PASSAGEWAY EXTENDING DOWNWARDLY INTO SAID BLOCK, A CYLINDRICAL CHANNEL EXTENDING HORIZONTALLY THROUGH SAID BLOCK, SAID PASSAGEWAY LEADING INTO SAID CYLINDRICAL CHANNEL, THE WALL OF SAID CHANNEL BEING THREADED AT ITS EXTREMITIES, A PAIR OF THREADED IDENTICAL SPRAY HEADS REMOVABLY MOUNTED IN THE ENDS OF SAID CHANNEL RESPECTIVELY, EACH OF SAID SPRAY HEADS HAVING A MAJOR INTERNAL DIAMETER PORTION AT ITS INNER END AND AN OUTER PORTION OF CONSTANTLY DECREASING INTERNAL DIAMETER, A DISCHARGING ORIFICE OF RELATIVELY SMALL DIAMETER AT THE OUTER EXTREMITY OF EACH SPRAY HEAD, SAID ORIFICES POSITIONED AXIALLY WITH RESPECT TO SAID CHANNEL, AND A CYLINDRICAL, FLOW-DIRECTING MEMBER IN SAID CHANNEL, THE ENDS OF SAID FLOW-DIRECTING MEMBERS RESTING IN SAID SPRAY HEADS RESPECTIVELY, A SPIRAL RIB EXTENDING OVER THE CYLINDRICAL SURFACE OF SAID MEMBER FROM ONE END TO THE OTHER, THE OUTSIDE DIAMETER OF SAID SPIRAL RIB BEING APPROXIMATELY EQUAL TO THE MAJOR INTERNAL DIAMETER PORTIONS OF SAID SPRAY HEADS, WHEREBY LIQUID UNDER PRESSURE REACHING SAID CHANNEL FROM SAID PASSAGEWAY WILL ENCOUNTER THE MIDDLE PORTION OF SAID MEMBER AND WILL BE DIVIDED AND DIRECTED BY SAID MEMBER IN OPPOSITE SPIRAL PATHS INTO SAID SPRAY HEADS RESPECTIVELY.