Plumbers' concerns include LEAKS, DRIPS, pipes, and traps. LEAKS refer to any unwanted water or gas escaping from a pipe, while DRIPS are small amounts of liquid that escape from a pipe or faucet. Pipes are the conduits through which water and gas travel, and traps are curved sections of pipe that prevent sewer gases from entering a building. All of these issues are important for plumbers to address in order to ensure the safety and efficiency of plumbing systems.