HEP₂0® push-fit plumbing system for hot and cold water, and central heating (except where stated). The fittings are for use with unplated copper or plastic tube. They are not suitable for use on stainless steel, or chrome plated copper tube. Never use flux or jointing compounds with HEP₂0® pipe or pipe fittings. Fully inserted HEP₂0® Smartsleeve pipe support sleeves must be used on all installations when using HEP₂0® plastic pipe. HEP₂0® conforms to the requirements for 'Class S' applications as set out in BS 7291:2010.