P&E FLOW TECHNOLOGY CO.,LTD .has received a number of 3-A Authentication in the US.P&E FLOW TECHNOLOGY CO.,LTD.Sanitary grade tubes, sanitary grade fittings,sanitray grade manholes,sanitary grade spray balls passed the annual examination of 3-A organization in the US.3-A Authentication standard of United States is a regonized and important international sanitary health standard.