Chapin 1979 Industrial 3.5-Gallon Viton Concrete Open Head Sprayer with Filter, 3.5-Gallon (1 Sprayer/Package) 3.5-Gallon Tri-Poxy tank for durability and a 4-inch wide mouth opening for easy filling and cleaning Compatible for most professional concrete applications, suitable for homeowners too (check chemical manufacturers instructions) Brass pump, wand, 2 female brass fan nozzles and shut off with lock on feature. Poly holster keeps wand and nozzles secure Viton seals and gaskets designed to handle a variety of chemicals (check chemical manufacturers instructions) Unique Tri-Lock seal feature that locks the pump cap tight