1.suction and transport waste. 2.vacuum pump. 3.hydraulic control rear door open or fixed rear cover. 4.Volume:20 to 35CBM This ALUMINUM SUCTION VACUUM TRAILER is Suitable for suction,transportation and dumping soil and mud from various sewer man-hole,oil field,water wells and sediment.It is necessary tool for city sanitation department,waste processing company,big factory……,it can help to clean ...