The OM Series is the most compact and economic pump in the Tsurumi VANCS Series. It is a semi-vortex design and can handle liquids containing moderate size of solids. Since the pump is made of special resin and stainless steel, it is corrosion resistant and lightweight. This pump uses food grade oil and it will not be a potential hazard to your precious pet fishes. The pump is equip with motor protector and will automatically shut down the pump if it experiences dry run. It is also equipped with an oil lifter inside the oil chamber and the life span of the pump is 50% longer than any other brands! The VANCS series is very reputable since 1988. The OM-series is the most compact and economic pump in the VANCS-series. It is a semi-vortex design and can handle liquids containing moderate size of solids. Since the pump is made of special resin and stainless steel, it is corrosion-resistant and lightweight. Applications: Pumping rainwater and Springwater from basement Circulating water in waterscape garden (e.g. waterfall, fountain, koi pond, etc.)