Dual fitting chimney cap

A dual fitting chimney cap adapted to be connected to chimney stacks of differing sizes, said chimney cap comprising:

• a) a cylindrical housing having an upper housing portion formed with a plurality of apertures, and a lower housing portion for attachment to an upper open end of a chimney stack of conforming cylindrical contour;
• b) said lower housing portion having a cylindrical cross-section of a prescribed diameter;
• c) annular transition means integrally interposed between and interconnecting said upper and lower housing portions;
• d) said annular transition means including a first annular region and a second annular region integral with and interconnected to said first annular region, said first annular region having a prescribed diameter larger in dimension than the diameter of said second annular region and larger in dimension than the diameter of said lower housing portion;
• e) said second annular region having a prescribed diameter smaller in dimension than the diameter of said lower housing portion;
• f) said first annular region presenting an annular bulge extending outwardly of said cylindrical housing;
• g) said second annular region presenting an annular bulge extending inwardly of said cylindrical housing, said lower housing portion including a generally circularly disposed array of internally projecting gripping elements equally spaced from one another each terminating in a free end, said lower housing portion including a generally circularly disposed array of outwardly projecting gripping elements equally spaced from one another each terminating in a free end, the individual outwardly projecting gripping elements each being interposed between a corresponding two of said inwardly projecting gripping elements.