Smith Performance Sprayers are built to work as hard as you do. They are durable, professional products with an emphasis on chemical resistance and built to withstand the most demanding work conditions. The NL401 4-Gallon cleaning and restoration series no leak pump backpack sprayer is perfect for large cleaning, degreasing, mold remediating and disinfecting jobs. it has more than 3 times the cycle life without critical failure compared to the competition - along with having fewer repair parts and the fastest repair time. Internal pump design will never leave chemicals dripping down your back. The internal paddles, activated by pump action, mix wet table powders and water-based chemicals alike. High grade Viton seals throughout the pump and shut-off allow this sprayer to stand up to tough chemicals and they are easily changed without using tools. Foldable pump handle reverses for left- or right-handed use and tank has a built-in carry handle with wand storage. Also features a breathable, full coverage, padded ballistic nylon harness with an adjustable chest clip and lumbar support to keep the sprayer in place at a consistent level with no bouncing. Multiple nozzles are included for ultimate versatility adjustable poly nozzle (enables stream to cone pattern), wide flat fan nozzle (red, 0.25 GPM, angled at 70 degree), narrow flat fan nozzle (yellow, 0.15 GPM, angled at 30 degree) and high performance foaming nozzle. Also accepts Tee Jet nozzles.