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Maverick Contracting wrote:

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wouldn't mind a big air op pump if can be toned down for finer spraying which i believe is possible and the benefits of air. had bad luck with 12v. my compressors are not big but can hook the two up if necessary

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 I suggest you look long and hard at this pump instead http://www.kleen-ritecorp.com/p-5442-versa-matic-e8pp6xpp9-38-pump-polyproplene-body-santoprene-diaphragm.aspx

Roof Cleaning and Softwashing Pumps powered by air can spray even a fine mist if you like, w/o burning up by cycling on and off like a 12 volt pump can do.