Customers asked, we listened. The Portable Cowsprayer Express is now not only portable, but with added features. Along with the 5 spray heads ( 1 on top, 2 on each side), the Cowsprayer now has a built in frame, side panels to adhere to any gate or fence, a standard flap and fly rub, a hitch for easy towing. Completely powered by the sun, the 25 to 40 gallon tank lets you set it and forget it for days. The perfect unit for small to mid-size herd.