Combination Sewer Cleaners The Power of Rearward. Thinking The B-Series and Guardian combination sewer cleaners by Aquatech feature a rear-mounted hose reel, providing a safer and more comfortable working environment for operators. Multiple products are available: combination sewer cleaner, combination jet vac, Aquatech truck, X-Vac, hydroexcavators, hydro excavators, hydro excavator truck, hydro excavation truck, hydro excavation truck manufacturers, Vacuum excavator truck, Hi-Vac, Hi-Vac Corporation, hi-vac trucks, O’Brien trailer jetter, O’Brien jetter, O’Brien jetting, O’Brien hydro jetter, O’Brien sewer jetter, hydro jetting vacuum system & more