... OEM producing experience 4.ISO9001,ISO14001 types of pump coupling,grooved fitting,types of pipe joints 1:Basic introduction: NameCoupling ... DN15-DN500MaterialDuctile ironFinishPaint, Epoxy or Galvanization ApprovalFM/ULUsage1) Automatic sprinkler system for fire protection on commercial, civil and municipal ... 5:Practical figure: 6:certificates obtained: types of pump coupling,grooved fitting,types ...