Chapin Professional 4-Gallon Backpack Poly Sprayer 6148B Large pump makes pressurizing quick with less pumping. Oversized filler cap makes filling neat and easy. Internal 4 position spray valve for expert pressure control from 15 psi to 60psi. Padded carrying straps for fatigue-free operation. poly extension wand for exceptional spray control. easy operating shut-off trigger with continuous spray feature. multi-use nozzle tips included. Positionable pump handle for right or left hand use. polyethylene construction with VITON chemical resistant seals provides for years of protection. Reinforced hose.