Roundup, 4 gallon, backpack sprayer, internal pump that will not leak on the user, delivers 150 psi, ideal for spraying insecticides high into trees, low pressure regulator delivers a continuous 25 psi, designed for comfort with thick padded straps, waist belt, chest strap & lumbar support, deluxe shut off with lock, padded grip & filter, built in agitator for constant mixing, fold away pump handle with locking storage strap, 3 nozzle system includes adjustable, flat fan & patented foaming nozzle, viton o-rings & seals for maximum resistance against harsh chemicals.