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Vitrified clay pipe systems for drains and sewers - Requirements for adaptors, connectors and flexible couplings Ingestion-build-183511 Annex C (Normative) Calibration of1 Scope This European Standard specifies requirements for adaptors and connectors made from vitrified clay and or other suitable materials for use with vitrified clay pipes and fittings for buried drain and sewer systems for the conveyance of wastewater (including domestic wastewater, surface water and rainwater) under gravity and periodic hydraulic surcharge or under continuous low head of pressure. Adaptors and connectors include insertable