Miller Coolmate 4 is a compact and portable coolant system designed for use with welding power sources up to 500 amps. It features a 4-gallon tank capacity and a powerful 1/4 HP motor that delivers a flow rate of 10 gallons per minute. The Coolmate 4 also has a built-in strainer to help keep the coolant clean and free of debris, and a relief valve to protect the system from overpressure. With its rugged construction and reliable performance, the Miller Coolmate 4 is an ideal choice for a variety of welding applications.