| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that when changing a direction of a pipe after setting a cap into a mouth of a tank body, the cap has to be rotated, and as a result, the air tightness between the cap and the mouth of the cap is decreased and there is a risk of causing a liquid leakage.SOLUTION: An inner wall surface of a hole part of a cap with an internal thread part fastened with an external thread part of the mouth of a tank main body is brought into slide contact with an outer circumference of O ring mounted in an annular groove of a pipe. Accordingly, even if the direction of the pipe is changed, the cap may not be rotated, thereby realizing a tank body that never causes a liquid leakage. |
