Which service valve is mandated in the RV industry?

In the RV industry, the Type I Overfill Protection Device (OPD) is mandated as a safety feature to prevent the overfilling of propane tanks. This regulation is crucial because overfilling can lead to dangerous gas leaks and potential explosions. The OPD includes a feature that automatically shuts off the flow of propane when the tank reaches a certain fill level, which is essential for ensuring safe operation and compliance with safety standards.

The other options, while they may refer to various types of valves used in different contexts, do not specifically address the safety regulations that govern the RV industry regarding propane systems. Adopting the Type I OPD enhances the safety of RVs and protects the environment, making it a key requirement in the industry.