passage holes for same in walls and floors, using ruler, spirit level, and plumb bob, Cuts openings in walls and floors to accommodate pipe and/or duct fittings, using hand tools and power tools, Cuts and threads pipe, using pipe cutters, cutting torch, and pipe-threading machine, Connects motors to control panels and balances motors to insure efficient operation, Connects control panels to power source, May weld holding fixtures to steel structural members, May install and maintain solar heating and cooling units, Perform additional assignments per supervisor's direction. standing / sitting; walking; pushing; pulling; bending; kneeling; crouching/squatting; seeing with or without correction; hearing with or without correction; wearing respirator and other PPE; typing / data entry; stepstool use; work in excessive heat; work in excessive cold; work in loud environment.