This Navien component is a specialized valve designed to facilitate the controlled release of liquid or gas from a system. Commonly used in heating and cooling systems, it features a robust construction that ensures durability and longevity. The valve operates via a simple twist mechanism, allowing for easy opening and closing as needed. Its primary function is to allow for the safe and efficient draining of excess fluid or gas from a system, thereby preventing potential damage or inefficiency caused by overpressure. This Navien product is compatible with various models of heating and cooling systems, making it a versatile addition to any maintenance toolkit.