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Precise Dimensions: 1/2 NPT external thread with a 21mm hexagonal outer diameter, designed for easy installation on air tanks and boilers. Wide Application: Ideal for truck boiler compressed air tanks and other applications including air compressors, petrochemical, gas processing, and power generation systems. Material: Made from durable brass with an internal stainless steel spring for long-lasting performance. Convenient Design: Equipped with a pull ring for easy drainage and pressure release, ensuring safe and efficient operation. Leak-Proof: Comes with a rubber seal layer to prevent leaks and ensure a tight seal under high-pressure conditions.