Overview of Specific Work Catagories Back Flow Preventors:    Installation    Testing Catch Basins & Interceptors:    Grease    Oil    Solids    Etc... Piping Catagories:    Sanitary Waste & Venting    Roof Drain Conductor    Acid Waiste    Potable Water    Non-potable Water    Pure Water and Deionized (DI) Water    Compressed Air    Natural Gas    Medical Gas Other Services:    Plumbing Fixtures, Equipment, Pumps    Sanitary and Storm Sewer    Water Service