A Square Waste Coupling is a plumbing component used to create a water seal in the drainage system of sinks, basins, or other plumbing fixtures. These couplings have a unique square or rectangular design, which sets them apart from traditional round bottle traps. They have a unique square or rectangular design, which sets them apart from traditional round bottle traps. The offered range comes in various sizes to accommodate different plumbing fixtures and drainage requirements. Square Waste Coupling is a functional plumbing component that plays a vital role in maintaining the hygiene and functionality of your bathroom or kitchen sink.