What is a connection made into a main that is full or under pressure called?

A connection made into a main that is full or under pressure is referred to as a "wet tap." This process allows a new service line to be connected while the main line continues to operate under pressure, ensuring that there is no interruption in service or loss of water pressure. Wet tapping is crucial in water distribution systems as it provides a means to expand the network without requiring system shutdowns, making it a practical choice for maintenance and service expansions.

When employing a wet tap, specialized equipment and techniques are utilized to ensure that no contaminants enter the water supply, and the integrity of the pipeline is maintained. This method is preferred for its efficiency and for minimizing disruptions to customers relying on the water supply.