... 2.Noise:70dba 3.Three-phase industrial vacuum bypass pump Industrial vacuum cleaners VC2201.voltage:220V, power 2000W2.Noise: ... 70dba3.Three-phase industrial vacuum bypass pump Technical specifications ... diameter 40mm, 2.5m length),40mm vacuum cleaner pipe,round brush vacuum cleaners , Pa vacuum nozzle,dust lane , water lane,dust ...