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Using 2mm (5/64) allen wrench, remove orifice from end of nozzle extension (Figure 23). 3. Remove in-line filter from other end of nozzle extension. 4. Use small diameter wire or a small paper clip to free any foreign material clogging or restricting orifice (Figure 23). 5. Using a garden hose, remove additional debris by back flushing water through nozzle extension (Figure 24). Back flush between 30 to 60 seconds.Turn adjustable nozzle extension to stream spray and move nozzle from low to high