PP Compression fittings are widely used in water supply and irrigation. Fast & Reliable connection: Split ring opening has been optimized to make pipe insertion even easier. Turning of pipes can be prevented by inner threaded during installation. Specification: Pipe and fittings shall be manufactured from virgid PP (Polypropylene) compounds. Compression fittings are an excellent alternative to sweating two pipes together. Fields of Application: Piping networks for water supply of public works. Piping networks for water treatment systems. Working pressure: At 20°C - PN16 (Threaded fittings: PN18).