What are capped pipe nipples that penetrate walls and floors called?

Capped pipe nipples that penetrate walls and floors are referred to as stub pieces. This term describes the short lengths of pipe that extend slightly beyond the wall or floor surface, designed to allow for future pipe connections or extensions without the need for removing existing structures.

Stub pieces serve a practical purpose in plumbing applications, as they facilitate easier access to the plumbing system for repairs or alterations. By using stub pieces, plumbers can maintain the integrity of the wall or floor while enabling the flexibility needed for future piping work. It also provides a clean, neat appearance and prevents water from entering the space within the wall or floor.

This specific terminology is important for effective communication within the plumbing profession, ensuring that all technicians understand the components of the plumbing system and their respective functions.