Patent ID: 8006856

Claim:
A seal ring ( 1 ) for a plug that is disposed inside a plug cap ( 2 ) which covers the plug, wherein the plug is provided with a liquid path and/or a gas path ( 12 ); and that seals fluid from the liquid path of the plug and/or fluid from the gas path ( 12 ) of the plug, comprising: an edge seal section ( 17 ) in an upper surface of the seal ring ( 1 ), abutting and being compressed and deformed against the plug cap ( 2 ), a surface seal section ( 18 ) in an inner surface of the seal ring ( 1 ), abutting against a seal surface ( 6 , 6 a ) of the plug, and a projection section ( 19 ) in an outer surface of the seal ring, wherein the projection section ( 19 ) is engaged with and deformed against a ring engagement section ( 16 a ) formed in an inner surface of the plug cap ( 2 ).