Regulator for diving

A regulator for diving comprising:

• a tubular coupler member adapted to be coupled to an air hose extending from an air source;
• a mouthpiece;
• a diaphragm;
• an air supply channel extending from said tubular coupler member to said mouthpiece being provided with a pressure reducing valve for said air adapted to be opened and closed by movement of said diaphragm and thereby to reduce the air pressure before said air is supplied to a diver holding said mouthpiece in his or her mouth;
• said tubular coupler member containing therein a filter assembly for said air;
• said filter assembly comprising a breathable cylindrical housing fitted into tubular coupler member, wherein said filter medium comprising first tubular filter medium and second tubular filter medium detachably press-fitted into said first tubular filter medium, said first tubular filter medium has meshes coarser than those of said second tubular filter medium and wherein an air passage in said filter medium starts from air vents formed in an outer cylindrical housing of the breathable cylindrical housing and terminates at an air vent formed in an inner cylindrical housing of the breathable cylindrical housing so that, along said air passage, said air enters said first tubular filter medium through its one end surface, after has left this medium through its inner peripheral surface, enters said second tubular filter medium through its outer peripheral surface and leaves this medium through its inner peripheral surface and reaches said air vent formed in said inner cylindrical housing.