Plumbing IV is the fourth year of a four-year training program. This is a theory class. Books, supplies, and personal safety equipment not included. Prerequisite: Plumbing III. Certificates will not be issued for attendance less than 144 hrs. Topics covered: plumbing theory, on-the-job task organization, sizing storm drainage, sizing vents, sizing drainage systems, combination waste & vent systems, sizing water supply pipes, servicing plumbing fixtures, installing pools/hot tubs, compressed air piping, hydronic heating, private waste disposals, private water supply, mobile home plumbing and mobile home parks.