Which valve is used on a Type 4 cut and cover tank for high level shutoff?

The valve used on a Type 4 cut and cover tank for high-level shutoff is the 129AF-3F. This valve is specifically designed for applications requiring a high-level shutoff function, ensuring that the tank is not overfilled, which could result in spills or other operational issues.

The 129AF-3F valve features mechanisms that allow for reliable operation in response to the tank's liquid level, making it suitable for scenarios where precise control of fluid levels is critical. In contrast, the other valves listed may serve different purposes or applications within fluid systems but do not provide the specific high-level shutoff functionality required for a Type 4 cut and cover tank.

Understanding the role and application of specific valve types is essential for effective maintenance and operational safety in water and fuel systems. The correct choice highlights the importance of selecting the appropriate valve to meet operational standards and safety requirements.