PPR Pipe Fittings And Their Benefits Compared to Metal Pipes Piping and fittings has an awesome significance for different purposes including everyday life and business purposes. Plastic pipe is a tubular section, or hollow cylinder made of plastic. Pipes are generally used to convey substances which can flow liquids and gases (Fluids), slurries, powders and masses of small solids. There are various brands of pipe manufacturers in the market but many feel to choose PPR pipe fittings for their houses. PPR pipe fittings are corrosion resistive and moisture free and perfect for compressed air. They are designed for all types of plumbing applications.