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4gal Commercial Wide Mouth Knapsack. The 4-gallon sprayer has many professional grade features including an extra large fill opening to prevent spills and a braided, power sprayer style hose. The sprayer also boasts an extra long 20-inch spray wand, a bonus nozzle system with four spray settings (single cone, double cone, single fan, double fan), and a large poly shut-off valve that's comfortable and thumb operated for ease of use. Perfect for all your bigger jobs, the sprayer has a powerful piston pump that allows for left or right handed use. With a 60 P.S.I. maximum and a one year warranty, H.D. Hudson's Commercial Bak-Pak Sprayer is sure to exceed your expectations.