Tree/Turf, 4 Gallon, Commercial Backpack Sprayer, Ideal For Weed Control, Pest Control & Fertilizers, Cap & Seal Design To Eliminate Leaking, Pressure Gauge For Maximum Efficiency, Adjustable Padded Straps With Lumbar Support, Pressure Control Located On The Unit, Includes 21 PSI CF Value That Attaches To The Stainless Steel Wand, Piston Pump.