The nozzles of the spray simply clip over a pre-dried p*pe (9/16* dia. hole). They are available in a variety of spray patterns, spray balls, spray angles and flow rates. They are made of stainless steel and corrosion-resistant plastic. They can used for pre-treatment, spray washing and parts cleaning.Heavy-duty sprig clip good to 100 p.s.l. at 175° F. A 316SS c*p is also available.