Connecting a POU water dispenser such as a cooler or boiler to the mains water supply requires an installation rail. An installation rail is modified pipework that allows mains water to flow into a POU machines water trail. All of our installation rail kits come with all of the required fixtures and fittings including compression fittings, non-return valves, pressure reducing valves and water blocks. You can purchase an installation rail on its own, or in a pack that includes water filters.