To blanket
spray an open space or a drain, a bigger nozzle is required.  Brass nozzle for garden hose seems to be the
best candidate.   
First,
the nozzle is fitted into a rubber hose, of which is fitted into a 20mm
polypipe.  The polypipe is finally fitted
into a 30mm reinforced PVC pipe.   To hold the pipes together, a rubber strip
from used tube is used to strapped the hose combination.


 
 
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