| 摘要 |
PROBLEM TO BE SOLVED: To make a casing main body of a fuel cap lighter, and improve the dimensional precision. SOLUTION: This fuel cap 10 is equipped with a easing main body 20 which houses a positive pressure valve 60 and a negative pressure valve 70 in a valve chamber 23. The casing main body 20 is equipped with an external pipe body 21, and a valve chamber forming body 22 which is formed inside of the external pipe body 21, and is integrally formed of a horizontal connecting part 28 and a vertical connecting part 29, of a resin, and at the same time, an area between the horizontal connecting part 28 and the vertical connecting part 29 is made to be a hollow part 27. |
