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Bear Bear ProHydrate Stainless Steel Waterer$37.99
The bowl attaches to standard garden hoses or 3/4 inch pipe. The bowl is made of all-weather 304 stainless steel. When your pet drinks and the water level drops, the valve opens and replenishes the water supply.
As the bowl refills, the float rises and closes the valve. This simple but effective system will not overflow, and no training is required for your pet to use it.