What is the large opening on a hydrant where LDH is connected referred to?

The large opening on a hydrant where large diameter hose (LDH) is connected is referred to as the steamer port. This designation comes from its primary function of supplying large volumes of water quickly, which is essential during firefighting operations. The steamer port is designed to accommodate the high flow rates necessary for effectively combating large fires, making it a critical component in efficient firefighting efforts.

While other terms like discharge port, supply port, and steamer connection might be used in different contexts, they do not specifically refer to the same type of large opening meant for high-capacity water delivery. For instance, a discharge port typically refers to any outlet on a fire apparatus used to release water, while a supply port may be more general and used in various systems. The specific terminology of steamer port emphasizes its crucial role in handling large amounts of water swiftly and is a well-known term among firefighters and hydrant operations.