TA Heimeier Adapter-Anschluss Vaillant 30 mm, 9700-27.700 : Amazon.de: Baumarkt
Uni LV Special thermostat squeeze connection, 7-28 °C, 0 * 1-5, liquid sensor, white, suitable for Vaillant thermostatic valves manufactured from 1981 - Oventrop GmbH & Co. KG