Dm fit atbc m series tube barb connectors dm fit atbc0606m a tube coupler from the dm fit atbc m series the 6mm barbed end is designed to fit inside a rubberised tube while the rigid 6mm stem fits into a push fit connectorthe 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 pneufit d atbc0606m pneumatic tube barb connector