A PVC sink coupling is a type of plumbing fitting specifically designed to connect two sections of PVC (Polyvinyl Chloride) pipe in a sink drainage system. It is used to join the sink's drainpipe to the main waste pipe or to connect other sections of PVC pipe within the plumbing system. Provides a secure connection between two PVC pipes, ensuring the smooth flow of wastewater from the sink to the drainage system. Has smooth, unthreaded ends that allow the pipes to slip into the coupling. It is secured with PVC primer and cement. Apply PVC primer and cement to the pipe ends and inside the coupling. Insert the pipes into the coupling and hold until the cement sets. If the PVC sink coupling becomes damaged or starts leaking, it should be replaced to ensure effective drainage.