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100% Brass Nozzle head with Stainless Steel Nozzle Insert and USA 1/2 in or 3/4 in Pipe Thread to fit your  existing piping.  Nozzles can be removed for easy cleaning.

 Note: The 3/4" version comes with an adapter which can be removed to allow  it to also fit 1/2" pipe threads.
 
Be cautious buying these from China.  The pipe threads on the ones  from China are metric and will not screw onto your pipes.