The Hudson 4 gallon NeverPump Bak-Pak is a convenient easy way to carry and spray larger amounts. Its high-performance rechargeable battery-powered pump sprays for 10 continuous hours on a single charge. The long spray wand has a curved tip for greater accuracy. Chemical resistant shoulder straps with adjustable pads make it more comfortable to carry. The large tank opening for easy filling has a built-in filter for keeping dirt and debris out of tank to reduce clogging. Extra-large fill opening prevents spills. Wide-mouth screen filter. Comfortable large locking thumb-operated poly control valve. 20 in.Long poly spray wand. UL listed charger shuts off automatically. AC adapter recharges battery in 9 hours. Battery sprays for over 10 hours on a single charge. PVC braided power washer-style hose stands up to harsh chemicals and resists kinking and clogging. Comfortable large locking thumb-operated poly control valve. Holds (4) gallons.