Which part of the piping system is described as 'any part of the piping system except a riser, main or stack'?

The term 'branch' refers to any part of the piping system that deviates from the main lines, risers, or stacks. A branch is typically used to connect different fixtures to the larger piping network, allowing for the distribution of water or drainage to various locations within a building. This means that it serves a crucial role in directing flow from the main supply or drainage system to specific points of use, such as sinks, toilets, or other plumbing fixtures.

In contrast, a riser refers to a vertical pipe that conveys water upward between floors, a main is the primary course of piping that supplies or distributes water throughout a system, and a stack is a vertical pipe used for venting purposes or for draining waste. Each of these has a distinct function within the plumbing system, which distinguishes them from branches that connect to these larger parts. Therefore, identifying a branch as any piping that is not a riser, main, or stack aligns with this definition.