Gilmour Back Pack Sprayer BP4 Teal/White Fast pressurizing polymer piston pump with adjustable pump seal and build-in filter screen can easily be serviced in field, no tools required External pressure control valve for easy adjustment from 15 to 90 pounds-per-square-inch; pump handle easily adjusts for right or left hand Viton seals in pump, discharge valve and pressure control valve; 56-inches chemical resistant reinforced pvc hose Molded contour frame with lumbar support; extra-wide, adjustable padded shoulder straps; storage compartment on service panel for extra spray tips Measures 18-inches in length by 11.5-inches in width by 21.5-inches in height; built-in carry handle; no assembly required