The sprinkler delivers a wide range.
Turn the red ring anticlockwise for a shorter jet or clockwise for a longer one.
Now the sprinkler delivers a minimum range.
If the sprinkler operation is abnormal, should the head become fouled by grit, sand, soil or other dirt, proceed as follows: holding the stem with one hand, unscrew the upper part;
take out the filter and clean it, together with the upper part of the sprinkler, under running water;
reposition the filter and reassemble the upper part of the sprinkler.
Cod. 90210