Birchmeier Senior 20K 5 Gallon Backpack Sprayer
http://www.amazon.com/dp/B0089EAR3O?tag=takingchances-21-20
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Birchmeier 20 Liter Senior Backpack (5 gallon) 2 Year Manufacturer's Warranty. Completely rebuildable. Birchmeier is the Best Backpack. Period! Stainless steel base. Rebuildable brass spray valve with brass spray tip. This is a professional grade product designed for many years of service. 5-gallon tank for extra productivity between fillups. Birchmeier is the choice of pest, weed and landscape professionals that know the difference.
http://www.amazon.com/dp/B0089EAR3O?tag=takingchances-21-20