The VDR 50 control unit, designed for regulating working pressure in liquid spraying, features a pressure-regulating diaphragm valve with manual adjustment, a bypass lever, and a glycerine bath gauge with a colored dial. Compatible with a range of AR and BHP pumps, it includes a rapid drain valve, a 4-way manifold with 2 (+2 optional) outlet valves for user connections, and an anti-drop system.