Dm fit achv m series push fit check valves dm fit achv0606m a 6mm push fit check valve from the dm fit achv m seriesthe valves 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 to prevent reverse flow dm fit achv0606m pneumatic check valve tube diameter 6mm