The Maxon STO Vent Valve is a normally open valve specifically designed for natural gas applications. This valve, with the model number 150SMA21-AA11-BB12A0, allows for easy and efficient venting of excess gas, ensuring a safe and reliable operation in industrial settings. With the trusted Maxon brand backing it up, this valve is a dependable and high-quality solution for managing natural gas flow in various business and industrial applications.