Sockets and accessories for series 519-520-521 valves
                                    Sockets:
                                    Light alloy sockets for 519, 520, 521 series distributors.
Connection to extremities of the socket via 3threaded holes.
Pressure must be supplied from 2side after 5stations.
                                    Display LEDs:
                                    The LEDs are inserted between the distributor and the connector. They display the valve status.