Chapin 4 Gallon Pro Backpack Sprayer (61900)Chapin 4 Gallon Pro Backpack Sprayer (61900) Your lawn will look better than ever with this handy and comfortable sprayer. The Chapin 4 Gallon Tree and Turf Commercial Backpack Sprayer is a hands free tool for your lawn care needs, and has a large four gallon tank, while providing the power to handle even the largest spray jobs. The sprayer features: an internal four position spray valve with excellent pressure control from 15 psi to 60 psi, a pump