The Ortho 2 Gallon Compressed Air Sprayer features a lockable shut-off to reduce hand fatigue, a nickel-plated brass poppet for strength and precision and an easy-to-clean, in-line filtration system. Viton seals offer the best chemical resistance to lawn and garden chemicals and are easily changed without using tools. The pressure release valve not only prevents over compression, but also helps prevent chemicals dispersing from tank onto the user prior to opening.