DIN Standards Committee Water Practice
ISO 21004
Plastics piping systems - Multilayer pipes and their joints, based on thermoplastics, for water supply
Kunststoffrohrleitungssysteme - Thermoplastische Mehrschichtverbundrohre und ihre Verbindungen für die Wasserversorgung
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NA 119-07-18-01 UA - Plastics piping components for water supply
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ISO/TC 138/SC 2 - Plastics pipes and fittings for water supplies