The 4775-0 Nu-Solve NR Sprayer is a Versatile Applicator Designed Exclusively for Nu-Calgon's Nu-Solve NR. The Backpack Sprayer is Designed with a Durable, UV Resistant, High Density Polyethylene 4 Gallon Reservoir with no Holes or Connections to Leak! The Large Graduated Tank Includes an Internal Pump and Provides Long Lasting Pressure between Pump Strokes. The Sprayer Includes a Big Mouth Tank with Strainer for Faster, Non-Splash Filling. The Nu-Solve NR Sprayer is Ruggedly Constructed with Reinforced Hose and Flexible Wand and Adjustable Nozzle. The Sprayer Includes Padded, Adjustable Shoulder Straps and a Convenient Carrying Handle