BS EN ISO 15874-1. Plastics piping systems for hot & cold water installations. Polypropylene (PP). Part 1. General Pipes, Pipe fittings, Polypropylene, Plastics, Water supply (buildings), Domestic, Hot-water supply systems, Cold-water supply systems, Water, Potable water, Hot-water central heating, Pipework systems, Pipe couplings, Classification systems, Environment (working)