Expansion tank with exchangeable diaphragm, PN 10 1" connection up to 100DE, 1¼" connection starting from 200DE Important: These expansion tanks are not in conformity with DIN 4807/T5 and, for that reason, not authorised for utilisation in drinking water systems in Germany in accordance with DIN 1988. For diaphragm vessels approved for use in drinking water in accordance with DIN 1988, see pressure boosting system accessories.