| 摘要 |
The present invention relates to a technique for preventing foreign substances, e.g., raindrops, falling from the top of a facility, e.g., an electric facility, from permeating a through-hole of a duct cover into which a full thread bolt is fitted. More specifically, the present invention relates to a leakage prevention cap for making the duct cover airtight against the through-hole by preventing raindrops, which rolls down along an outer surface of the full thread bolt when the full thread bolt penetrates the duct cover, from falling down along the through-hole of the duct cover. The leakage prevention cap is made of an elastic synthetic resin material, thereby preventing the raindrops from permeating the through-hole of the duct cover even if the duct cover through which the full thread bolt is connected shakes due to external force. |
