Chapin’s 19149 Dripless Industrial Concrete Open Head Sprayer is compatible for most professional concrete applications and suitable for homeowners. Its 3.5 Gal. Tri-Poxy tank is protected against rust, corrosion and denting and the 4 in. W mouth filling and cleaning easy. The professional dripless shut-off has a comfort grip lock-on/off feature, brass wand and nozzle. Chemical-resistant seals and gaskets are designed to handle a variety of chemicals (check chemical manufacturers instructions) and its unique tri-lock seal locks the pump cap tight.