4: Plumbing Systems Last updated Save as PDF Page ID 2296 Clifford Rutherford University of Hawaii Maui College via University of Hawaiʻi OER 4.1: Piping and Fittings 4.2: Domestic Water Service 4.3: Drain, Waste, and Vent (DWV) 4.4: Valves and Prevention Devices 4.5: Faucets, Fixtures, and Fixture Drains 4.6: Plumbing for Appliances 4.7: Water Heating