10 pack of HX60/28W Hep2O SmartSleeve plastic pipe inserts in 28mm size can be used for hot and cold water, as well as heating systems. Best used in conjunction with other Hep2O products, although can be used with traditional copper pipes. The Wavin Hep2O SmartSleeve pipe support insert with push-fit connections is made of food-grade stainless steel and is contaminant-resistant. It is designed to be captive in the pipe. However, it can be removed using long-nose pliers where needed.