NEXOR PP Compression Fittings are used to connect PE pipes. Using Compression Fittings is the easiest way to make pipe connections. No equipment is necessary - just simply insert and twist to connect pipes. Twisting action compresses the clinching ring which buries itself into the pipe for a secure fit. Features: ​ISO 14236, BS 5114 suitable for ISO 4427 PE pipes. Made of virgin grade Polypropylene resin. O-ring made of high quality Nitrile Butadiene Rubber.