Plast compression fittings are suitable for use with the whole range of HD polyethylene pipe. Outer dimensions manufactured to ISO standards. from 16mm to 110mm. The perfect seal - achieved by the rubber O-ring - ensures complete water-tightness whether the pipe is bent or straight. It works well in high-pressure as well as low-pressure applications. The resistance of these 16bar. fittings to pull-out exceeds the requirements of all the standards.