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With the Trough-O-Matic valve, you can automatically control water levels for plastic and metal waterers, troughs, and pans. This all-plastic float valve flows up to 245 gallons per hour and operates between 20-50 psi for consistent and reliable water level maintenance. It is made from durable materials and comes in a rugged plastic case that includes expansion brackets. These extension brackets help you create the most secure fit and allow the valve to fit tank rims up to 2” thick and 4.325” wide.