| 摘要 |
A two-element plug having an elastomeric body and a nonsealing retainer molded within the elastomeric body, the retainer having gripping edges which springingly engage portions of the hole walls to maintain the plug body in place, even against a rough as-cast surface having a draft angle. Discontinuities are formed in the gripping edge periphery through the use of scallops and the gripping edge periphery extends beyond the elastomeric periphery to promote better engagement of the walls of the aperture. When used with noncircular holes having rounded corner portions, the retainer is truncated in the corner portions.
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