The 3/4" FPT Auto Flush Drain Valve is designed to automatically remove debris and sediment from irrigation systems, helping maintain clean lines and consistent performance. Installed at the end of a mainline or lateral line, this valve opens when system pressure drops below 5 PSI, flushing out dirt and contaminants, and then closes automatically when pressure is restored. Featuring a 3/4" female pipe thread (FPT) connection, this valve installs easily into new or existing irrigation setups.