Chapin 22240XP 2-Gallon Industrial Acid Staining Sprayer with Pressure Relief Valve For Acid Staining and Acid Cleaning, 2-Gallon (1 Sprayer/Package) 2-Gallon translucent poly tank with 4-inch wide mouth opening for easy filling and cleaning Designed specifically for acid stain applications Acid and chemical resistant seals and gaskets and pressure relief valve Shut off has lock-off feature to prevent accidental disharge Adjustable poly cone nozzle sprays coarse stream to a fine mist