Which service valve is mandated in the RV industry?

The Type I OPD (Overfill Protection Device) is mandated in the RV industry because it is specifically designed to prevent the overfilling of propane tanks. This is crucial for ensuring safety during the filling process, as overfilling can lead to hazardous situations, including leaks or potential explosions due to excess pressure in the tank. The OPD helps by automatically limiting the amount of propane that can be filled, providing a significant safety feature that is recognized and required by industry standards.

In contrast, the other options do not have similar industry mandates focused on overfill protection in RV applications. While they might offer various benefits or features for specific applications, they do not meet the same regulatory requirements as the Type I OPD, highlighting the importance of safety regulations in the functionality and compliance of RV propane systems.