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Tattle™ pressure relief vent indicators offers a simple yet innovative solution to quickly identify when a pressure relief valve has been activated. A Tattle™ installed on the outlet of a pressure relief valve (PRV) can be the first line of defense against the costly and potentially hazardous release of refrigerants such as ammonia, Freon, steam, or other compressed gasses. By providing a visual indication of what can be an intermittent event, the Tattle™ allows the system operator a quick, reliable, and cost effective solution to a problem that could go undetected for a significant amount of time.