This part is located within the filling loop section of the appliance. The filling loop is a part that only occurs on boilers and 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 external or internal, depending on the type of appliance you have. If the filling loop is external to the appliance it is usually removable due to water regulations. However, if the loop is internal, there is usually a key that can be removed to interrupt the filling loop connection after use. Colour: Grey

Brand Name	Worcester Bosch