The OWS Pressure Relief Valve is engineered to protect your pond or lake aeration system from costly compressor and windmill damage. Unlike fragile plastic alternatives, this all-steel valve withstands freezing temperatures, blockages, and backpressure to ensure reliable year-round operation. It automatically releases excess air pressure when the airline freezes, clogs, or becomes blocked, preventing dangerous backpressure that can lead to compressor burnout. Designed for 3/8" and 1/2" airlines, it installs as a direct replacement for factory-installed valves-no modifications needed. Built by experts in aeration systems, this valve delivers peace of mind and uninterrupted system performance.