Dm fit auc m series push fit tube union connectors straight dm fit auc1004m a 10mm to 4mm push fit tube coupler from the dm fit auc m seriesthe couplers are manufactured from safe non toxic materials meeting the requirements of the us fda wras ansinsf 51 61 and sk zert they are widely used in water purification foodbeverage and pneumatic systems dm fit auc1004m pneumatic tube union connector diameter 10mm to 4mm straight