The Worcester Bosch Keyless Filling Link 7716192610 is easy to install and reduces the risk of call-outs to top up the system. The accessory is WRAS approved and operates via a simple lever operation means no key or hose is required. The Worcester Keyless Filling Link is designed for installers to make the maintenance of a home heating system easier for their customers by removing the difficulty they often experience in operating the filling link after the temporary connection has been made. This reduces the amount of enquiries installers receive from those who have removed a radiator and need to top up the system with water.