Miraco automatic waterers use a 521 High-Pressure valve in almost all of their waterers. They redesigned their valve to a new version that features a single base.
Whether you're using the 521 Blue valves or the 521 Grey valve, you will find that the valves will accommodate older and newer style Miraco waterers. Each valve will handle water pressures of 40-80 PSI and feature the same thread size, making them easy to change and service.
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