• Discuss problems and requirements with customers and supervisors
• prepare and/or study drawings and specifications to work out the layout of plumbing systems and materials needed
• find and mark position for connections, then cut holes through walls and floors to accommodate pipes, measure pipes and mark cutting or bending lines
• cut, thread and bend pipes, assemble and install piping, valves and fittings, join pipe sections and secure pipes
• install equipment such as boilers, pumps, heating and cooling systems, gas appliances, water tanks, water heaters, solar water heating systems, fixtures such as toilets, wash basins and industrial processing units
• test lines as required by local plumbing regulations
• maintain and repair plumbing systems.

Depending on training, requirements and regulations Plumbers may perform all of the tasks listed above.