The Chapin 1 Gallon Industrial Acid Staining Sprayer (22230XP) is a specially designed sprayer which offers 40% more pump volume per stroke. It is constructed from durable and lightweight polyethylene material which is non-corrosive with most pesticides, herbicides, fungicides. and fertilizers. This 1-gallon sprayer features COPT seals and gaskets in key areas that can easily handle acid based stains. It also features a metal industrial pump handle, and a special lock-on feature to help reduce fatigue. Its translucent body allows you to monitor tank level without the need to remove pump cap. It has a 4-inch opening that allows you to clean and fill it easily.