The suction boom is an accessory designed and sized to be incorporated into machines equipped with tanks to sludge suck (or similar fluids) from road gullies. The suction is created by vacuum inside the tank (e.g. drainage vehicles). The suction boom allows simplifying the operator's work by nearing the hose to the workplace. 

The suction boom is normally installed on the upper part of the tank. 

It essentially consists of a hydraulically or electrically operated telescopic arm (which houses a suction pipe) connected to one end of the sludge tank.