The Massachusetts Plumbing Code does NOT consider a _______ as the basic part of a trap.

The trap arm is not considered a basic part of a trap according to the Massachusetts Plumbing Code. In plumbing terminology, a trap consists of specific components that function together to prevent the escape of sewer gases while allowing wastewater to flow. The primary parts of a trap include the trap body, which holds the water seal, and the drain connector, which connects the trap to the drainage system.

The trap arm, while essential in the overall drainage system, connects the trap to the drainage piping but does not form part of the trap structure itself. Its primary role is to facilitate the flow of wastewater from the fixture through the trap to the drainage system, aligning with plumbing code requirements. The vent pipe, although crucial for maintaining air pressure in the drainage system, also does not comprise the trap itself. Thus, the distinction of the trap arm as not being a basic part of the trap aligns with the definitions and roles stipulated in plumbing codes.