| 摘要 |
PROBLEM TO BE SOLVED: To improve air tightness of an inside of a box 4 in relation to a buried type gas plug having a box 4 opening toward an opening 3 installed in a back side of a wall plate 3 having an opening 30 formed thereon, having a gas plug main body 1 and a plug part 11 stored in the box 4 in an attitude facing the opening 30 side and having an insertion through hole 40 through which a pipe connection part 10 can pass punched on a component surface of the fire-resistant box 4 to which the pipe connection part 10 extending from the gas plug main body 1 corresponds to. SOLUTION: A blocking plate 5 blocking whole zone of the insertion through hole 40 and having an opening part 50 of a size and a shape with which the pipe connection part 10 can be inserted through under a roughly close fitting condition formed thereon is provided. COPYRIGHT: (C)2006,JPO&NCIPI
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