Plastics piping systems for water supply or drainage and sewerage – Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) – Recommended practice for installation; German version CEN/TS 14578:2003
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2003

Plastics piping systems for water supply or drainage and sewerage – Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) – Recommended practice for installation; German version CEN/TS 14578:2013
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2014