For heavy-duty jobs, the H.D. Hudson Regulator Bak-Pak Sprayer can't be beat. Designed for functionality and comfort, this large backpack chemical sprayer features a pressure regulator that eliminates chemical waste by issuing a constant stream of 21 PSI. The one-piece tank is guaranteed not to leak and features a contoured design for user comfort. Complete with an 18-inch curved brass spray wand, you'll be able to reach the toughest spots when working with this sprayer.