... 4.Energy-saving,large gas volume Electric-magnetic Air pumpScope of use:This series of pumps is ... non-lubrication one, which gives off very clean air, it can be used for aquatic breeding, ... Convenient to operate without oil, noise and air pollution.2.Cylinders and pistons ae of excellent materials, which ... gas volume, the ratio of the electromagnetic pump air compressor power is about one-fifth of the ...