Smith Performance Sprayers NL400 4-Gallon No Leak Backpack Sprayer for Landscapers Applying Weed Killers and Fertilizers 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 Durable, 21 inch stainless steel wand with exclusive poly lining and 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