7716192610 – Worcester Bosch Keyless CA Filling LinkThe Worcester Greenstar Keyless Filling Link is a boiler accessory designed to make topping up or re-pressurising your central heating system easier on Worcester Bosch boilers. Instead of having a separate filling loop, key or hose to connect when the system pressure drops, this keyless link stays connected and allows you to operate the filling point with a simple lever.Operates via a simple lever operation means no key or hose is required.