Manufactured with top of the line components and a lightweight corrosion-resistant aluminum frame - this Kings 50 Gallon 4-Wheel Sprayer is 2nd to none! The CDS-John Blue poly diaphragm pump can hold up to harsh chemicals and will outlast standard pumps with ease. These sprayers are normally pulled by hand in a nursery or greenhouse. Spray up to 4.3 gpm or up to 290 psi depending on your application and use the extra hose length to spray hard to reach areas.