Filtering filler neck breather cap

Claim 1

A FILTERING CAP COMPRISING OPEN-ENDED, TUBULAR RETAINER MEANS, A CAP BOTTOM MEMBER FIXED TO SAID RETAINER MEANS AND CENTRALLY PERFORATED TO COMMUNICATE WITH ONE END OF SAID RETAINER MEANS, SAID CAP BOTTOM MEMBER BE ING FORMED WITH A SERIES OF PERFORATIONS LOCATED RADIALLY OUTWARDLY RELATIVE TO SAID RETAINER MEANS AND BEING FORMED WITH AN ANNULAR, UPSTANDING WALL LOCATED RADIALLY OUTWARDLY RELATIVE TO SAID SERIES OF PERFORATIONS, A CAP COVER MEMBER HAVING A CLOSED TOP WALL AND AN ANNULAR, DEPENDING WALL TELESCOPICALLY ASSOCIATED WITH SAID CAP BOTTOM MEMBER ANNULAR WALL, SAID CAP BOTTOM MEMBER AND CAP COVER MEMBER THUS DEFINING A CHAMBER, MEANS FOR SECURING SAID ANNULAR WALLS AGAINST SEPARATION, A FILTER CARTRIDGE RECEIVED IN SAID CHAMBER, SAID CARTRIDGE COMPRISING A PERFORATED, ANNULAR BOTTOM WALL, AN UPSTANDING, IMPERFORATE OUTER WALL ARRANGED IN SEALING ENGAGEMENT WITH ONE OF SAID CAP MEMBERS, AND AN UPSTANDING, IMPERFORATE INNER WALL HAVING PERIMETRAL SEALING ENGAGEMENT WITH SAID CAP BOTTOM MEMBER IN A REGION LOCATED RADIALLY INWARDLY RELATIVE TO A SERIES OF PERFORATIONS AND TERMINATING SHORT OF SAID COVER CAP MEMBER TOP WALL, AND A MASS OF FILTER MATERIAL SNUGLY RECEIVED IN THE ANNULAR SPACE BETWEEN SAID CARTRIDGE UPSTANDING WALLS.