Consider Hudson spray guns. They range in price from $100 to over $200, and are bullet proof. I've run multiple herbicides and insecticides through mine, and it still works like it did when I got it years ago. Many sprayers aren't happy with copper based chemicals, and corrode if not cleaned immediately after every usage. Hudson's don't care. Pencil stream to near fog.
You can look at them at Amazon. Just search HD Hudson.
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