Smith Performance Sprayers NL402 4-Gallon No Leak Backpack Sprayer for Water-Based Cleaners, Sealers, Release Agents and Curing Compounds Exclusive, internal No Leak Pump never leaves harsh chemicals dripping down your back and pressurizes to 150 psi Built-in agitator can handle liquids, powders, and water-soluble solutions. Agitator keeps them mixed, in solution, and ready to spray Brass, 18 inch wand containing a no-drip valve stem and shut off with the highest quality Viton seals for maximum chemical resistance Achieves 65% higher pressure than leading diaphragm pump backpacks. Spray hard-to-reach areas and create more precise spray patterns Patented pump design has minimal high-wear parts (60% fewer replacement parts) and can be repaired in minutes without tools. Less down time! This is an O.E.M. part