|1. Includes the work and/or practice, materials and fixtures used in the installation, removal, maintenance, extension, and alterations of a plumbing system of all piping, fixtures, fixed appliances and appurtenances in connection with any of the following: sanitary drainage, storm drainage facilities, special wastes, the venting system and the public or private water supply systems, within or adjacent to any building, structure, or conveyance to their connection with any point of public disposal or other acceptable terminal within the property line.
2. The pipes, fixtures and all other apparatus concerned in the introduction, distribution and disposal of water in a building.
3. The pipes, fixtures and other apparatus of a water, gas or sewage system.
4. The work of a plumber.