The DAB's booster sets with 2 self-priming JET pumps feature base, suction and delivery manifold and 2 membrane vessels. They also contain tanks and air feeder connections. The booster set's electrical panel contains an automatic inverter that handles the pump starting order, at each start-up. It also contains a main switch, and optionally, it can contain a float or pressure switch for protection in operations where water is not present. The low-voltage auxiliary circuit contains a transformer and fuse.