A Worcester Bosch filling loop is a part that only occurs on systems that deal with central heating. If the pressure in the central heating system has fallen too low, the filling loop enables the user to manually adjust the amount of water there. Depending on the appliance you have, filling loops may be internal or external. Given that the water regulations require the loop to be removed after usage, an external loop will often be detachable. The filling loop connection can be broken after use i

Brand Name	Worcester Bosch