Which appurtenance is characterized by a triangle-shaped handle?

The appurtenance characterized by a triangle-shaped handle is known as the Type 1 Overfill Protection Device (OPD). This type of OPD is commonly found on portable propane cylinders and is designed to prevent overfilling by providing a visual and tactile indication of the device's status. The triangle handle serves as a clear identifier, allowing users to recognize that it is equipped with an overfill protection feature.

Understanding the specific design characteristics of propane tank appurtenances, such as the OPD, is crucial for ensuring safety and compliance with propane handling regulations. The other types of OPDs do not utilize a triangle-shaped handle, which differentiates the Type 1 from the other options listed, leading to its unique identification within the propane industry.