Lays out, assembles, installs, main water pipeline, main sewer pipe line, storm drain systems, flanged piping and valve installations, applying knowledge of system operation, and following blueprints: Selects type and size of pipe, and related materials and equipment, such as thrust blocks, restrained joints tie ins, service lateral and fire hydrants according to specifications. This may include operating hand and power tools of all types, cleaning and preparing job sites, digging trenches, setting braces to support the sides of excavations, erecting scaffolding, cleaning up waste materials, and assisting other craft workers.