The invention provides a connector having: a. a chamber having an open upper chamber and a lower chamber, b. an inlet connector and c. an outlet connector formed in a floor of the lower chamber. The inlet connector is supported above the open upper chamber by one or more arms. The upper chamber has an upper chamber floor having an upper chamber outlet, the upper chamber being in fluid communication with the lower chamber by means of the upper chamber outlet. The upper chamber outlet has a non-return valve which is arranged to open at a pre-selected pressure and the lower chamber forms a flow conduit for receiving the valve when it is open. In some embodiments a shielded connector is provided in which a shield is shaped to cover the open upper chamber of the connector. A valve assembly may be provided for use in the connector or shielded connector wherein the valve assembly has a stem, a biasing member for biasing the valve assembly into a closed position, a valve disc for sealing the outlet. An upper washer and a lower washer are disclosed for support of the valve disc such that the valve disc does not distort in use.