Automatic pressure relief valve releases pressure at 45 psi or can be manually operated to release pressure. Heavy-duty HDPE tank is extremely durable yet light, with easily visible fill level markings. Ergonomically-shaped commercial shut-off valve and strong nylon-reinforced hose. High-quality seals fitted to all parts that come in contact with chemical. Equipped with Viton® seals and O-rings for use with acidic liquids and solutions that contain oil or harsh solvents.