Built-in pressure gauge enables real-time monitoring of system pressure, ensuring efficient maintenance and troubleshooting. All-in-one brass assembly combines three essential functions for simplified installation and comprehensive boiler protection. Integrated valve automatically releases excess pressure, preventing overpressure situations and safeguarding your equipment. Automatic vent continuously eliminates trapped from the heating system, optimizing heat transfer and preventing circulation issues. DN20 size offers optimal flow capacity, making it suitable for both residential and commercial heating applications with long-lasting durability., Manufacturer: YUXVBTZXD