The WPM120 is an extremely rugged 6 door opening, energy free unit for cattle. It has simple installation, attractive design & has animal friendly flaps - no ball or float closures to ice. Nature's ground water temperature does this job. Polar Max Drinkers operate like thermos all year long. Stainless steel bolts & removable top afford easy access to plumbing. Optional wing bolts are available for Grade A inspections. Unique baffles guard against icing & keep valve operating under severest conditions. Notched flanges for easy anchoring. Weather strip & an insulated sleeve for the supply line come with each unit. no heat well needed; use an 8-12" tile; can be fitted on most existing pads. Sealed bottom keeps out moisture & rodents. 2-2" drain holes for fast clean out. Foam insulation between walls has an R-value of 7.14". Double wall DURAROCK construction contains hindered amine light stabilizer, the most effective ultraviolet inhibitor. Seamless sidewall cannot leak. Tolerance to water level - you don't have to worry about summer & winter water levels. Dependable, non siphoning valve - proven & trouble free. Livestock can drink out of both flaps at the same time, not always so with a ball closure. No pulleys & cable to foul & rust. Serves 350 beef, 150 dairy, 225 cow/calf.