Monitor VAJRA-331 mounted on water powered Oscillating Unit, transforms the manual Monitor into an Oscillating Monitor. The unit is suitable for use in high risk areas such as tank farm facilities, aircraft hangars, offshore, refineries, chemical plants, and heliports. The Monitor possesses several design features that provide ease of operation, minimum maintenance and resistance to corrosive environments. This Oscillating Monitor can be used with Water (with a Master Stream Nozzle) as well as Foam (with a Hydro-Foam Nozzle). HD Oscillating Monitor Vajra331-S is UL Listed.