Automatic pressure relief valve releases pressure at 45 psi or can be manually operated to release pressure. High-quality, chemical-resistant flat fan spray nozzle. Heavy-duty HDPE tank is extremely durable yet light, with easily visible fill level markings. Ergonomically-shaped commercial shut-off valve with lock-on/lock-off feature and strong nylon reinforced high-pressure hose. Equipped with Viton® seals and O-rings. This sprayer can also be used with solutions that contain oil or solvents. The pump system is sealed to prevent these aggressive liquids from causing any mechanical damage. This contributes to a long service life.