| 1. A cover useful for covering an open end of an access conduit, which comprises:
a) a substantially-circular, disc-shaped base portion having a top surface, a bottom surface, and a circumferential edge,
said base portion being dimensioned to cover said open end;
b) a plurality of groups of stability tangs attached to and extending downwardly from said bottom surface of said base portion,
said plurality comprising any number of groups of stability tangs between two and twelve, inclusive,
wherein each of the groups may comprise any number of individual stability tangs between two and six, inclusive, wherein adjacent
groups of stability tangs are disposed separate from one another sufficiently that no portion of any stability tang that is
a member of a first selected group of stability tangs is disposed at a distance closer than at least one and one-half times
the width of the individual groups of stability tangs present to any portion of any stability tang that is a member of a group
of stability tangs adjacent to said first selected group.
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