Scope of practice for plumbers or gasfitters.

(a) For the purposes of this part, the term “plumber” means any person who designs, installs, repairs or removes plumbing fixtures intended to receive and discharge water, liquid, or water-carried wastes into the drainage system with which they are connected; or who introduces, maintains or extends a supply of water through a pipe or pipes, or any appurtenance thereof, in any building, lot premises, or establishment; or who connects or repairs any system of drainage whereby foul, waste, or surplus water, sewer gases, vapor or other fluid is discharged or proposed to be discharged through a pipe or pipes from any building, lot, premises or establishment into any public or house sewer, drain, pit, box filter bed or other receptacle or into any natural or artificial watercourse flowing through public or private property; or who ventilates any building, sewer or fixture or appurtenance connected therewith; or who excavates any public or private street, highway, road, court, alley or space for the purpose of connecting any building, lot, premises, or establishment with any service pipe, house sewer, public water main, private water main, public sewer, private sewer, subway, conduit, or other underground structure.