If you keep your shampoo units busy then you've got a lot of hair falling into the pipes, just building up down there, waiting to clog everything up and cause some expensive problems. This hair trap saves you the headache of an emergency call to the plumber with a mesh filter that will catch anything that might accidentally drop down the drain like jewelry, paper, and hairpins. It replaces the P or S traps you already have on your sinks, and it just takes some twisting to install it. The side cap is connected to the mesh trap, so when you need to clean it, just unscrew it and pull it out.