Abstract: A ball valve adaptor assembly for connection to a ball valve cartridge and for connection to a valve actuator, wherein the adaptor comprises: an outlet connector, the outlet connector comprising an outlet connector plate and an outlet pipe, the outlet connector plate configured to connect to a housing outlet of the ball valve cartridge with the outlet pipe extending away from the housing outlet, and an inlet connector, the inlet connector comprising an inlet connector plate and an inlet pipe, the inlet connector plate configured to connect to a housing inlet of the ball valve cartridge with the inlet pipe extending away from the housing inlet, an actuator connector configured to reversibly connect to the outlet and inlet connector plates and configured to reversibly connect to the valve actuator, and wherein in use, when the outlet plate, inlet plate and actuator connector are connected, a cartridge cavity is formed between the outlet plate, inlet plate and the actuator connector, and wherein the cartridge ca