PVC couplings are one of the simplest and most inexpensive types of PVC fittings. Couplings are a very short lengths of pipe or tube applied in the piping system. These couplings find use to connect the pipes and to adjust the thickness of the tubing. They also help to patch broken or leaking pipes. PVC couplings are widely used for water supply, water treatment, petroleum, gas, chemical industry, environmental protection, pharmaceutical, and other fields. PVC couplings commonly serve to prolong or stop pipeline operations. They are applicable in diameters ranging from 1/4 to 12 inches. These couplings are of high quality, corrosion-resistant, and available in multiple sizes and configurations to fit the pipe they will connect. In this article, we review the types of PVC couplings to help you find the best one that suits your needs.