The filling loop is a part that only occurs on systems that deal with central heating. The filling loop allows the user to manually modify the volume of water within your central heating system. Filling loops can be internal or external, depending on the type of appliance you have. External filling loops are usually removable as the water regulations state that the loop must be removed after use. However, if the loop is internal, there is usually a key that can be removed to interrupt the filling loop connection after use.
- Supplier Part Number: 014731
- Fits a large number of Vaillant appliances