Echo MS41BPD Backpack Sprayer Genuine OEM Echo Part 4 Gallon; Pressure Rating (psi) 90; Dry Weight 9.9lbs ; Large 6" ID cap opening - largest in the market; Double-thick shoulder straps - adds additional comfort Combines higher pressure of a piston pump with extended life span of a diaphragm pump; Dual-displacement combination piston and diaphragm pump 3-stage filtration; Viton formulation - increases durability; Use with liquids and many wettable powders; 28" stainless steel wand with brass nozzle Replaces: MS40BD