PREVAL SPRAY GUNS – The Complete Preval Paint Sprayer consists of a Power unit assembled to a Product Container. The Power Unit sprays up to 16 ounces of liquid (depending on viscosity) before exhausting its gas. Extra Power Units are available complete with new spray button, dip tube and strainer. Extra Product Containers are also available with screw-on caps for storage of liquids. Product is sold by the each.