Since 1902, Chapin has been making professional-grade sprayers - and the Diaphragm Pump, 4-gal. Backpack Sprayer continues in their legacy of excellence. This sprayer features Viton seals, a 20'L poly spray wand and 48'L spray hose to hit all of those hard-to-reach areas. Weighs 10.3 lb. Chapin ProSeries 4-Gallon Backpack Sprayer with Diaphragm Pump