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Drilling Diameter:Φ90-125mm(4″-5″) Capacity of Compressor:17m³/min(600cfm) Pressure of Compressor :1.7MPa(250Psi) Diesel Engine:Yuchai YCA08280-T300,205kw/280hp or Cummins QSC8.3-C260-30 ,194kw/260hp