Your plumbing projects require more than just pipes and pumps. You need all those little fittings that make the your plumbing system work. These plumbing fittings are important for nearly every part of your bathroom—from shower to sink, toilet to tub. Some of the plumbing findings you may use on projects include couplings, support sleeves, small pipes, tubes and valves. The fittings available may seem a bit overwhelming.