a degassing tubular device is provided having an inner tube of a porous polymeric resin positioned inside an outer tube of a porous polymeric resin , and having a tube - form body formed from a porous polymeric film interposed between the inner and outer tubes , wherein the porous polymeric film has a mean pore size of 0 . 2 to 3 . 0 microns . the inner tube , outer tube and film are preferably all of porous polytetrafluoroethylene .