Yep...to cut a long story short ...you will need one with Viton o-rings/washers etc in it. They are designed to handle pesticides which have some very nasty (o-ring swelling ability) carrying agents in 'em. Ask at any farm/chem supply shop. I worked in one for 10 years & thats what we sold people/farmers/councils & it worked. Viton are almost always red.