Patent ID: 8202032

Claim:
An installation comprising: a support; a cover member having opposed surfaces and composed of a first material; a fastener fastening said cover member to said support and having a head disposed between said surfaces with a counterbore between said head and one surface; and a plug disposed in said counterbore and composed of said first material and having an exterior surface co-planar with said one surface and having a portion of reduced diameter remote from said exterior surface, said plug having a peripheral surface adjacent said exterior surface which engages a circumferential wall portion of said counterbore adjacent said one surface in a generally force fit relationship said plug having an upper enlarged cylindrical portion and a lower reduced cylindrical portion with a tapered transition portion between said upper enlarged cylindrical portion and said lower reduced cylindrical portion, and said upper enlarged cylindrical portion, of said plug engaging said counter bore and said lower reduced cylindrical portion spaced from said counter bore to form an annular cavity.