The Chapin Xtreme Industrial Concrete Open Head Sprayer – Model #19049 has a 3.5-gallon tri-poxy lined steel tank that provides triple protection against rust, corrosion and damage from denting. Featuring Xtreme Seals that are resistant to the most extreme chemicals including Acetone, Naphtha, Xylene and Toluene. Offering a large 4-inch mouth opening for easy filling and cleaning, brass wand, brass shut-off, brass fan tip nozzle for even coverage, a 48-inch reinforced hose with threaded fittings and Viton seals for most concrete sealer applications. The open head tanks have a unique Tri-Lock seal that ensures the pump cap locks tightly into place.