| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost by using a grommet without special seal means for a seal of a split housing of a check-valve attached to a booster shell of a negative pressure booster through the grommet. SOLUTION: A housing 13 of a check-valve 6 is made to be constituted of a housing body 15 and lid body 16 fitting into the housing body 15. An annular first and second seal lips 37, 38 close to these external surfaces are formed in a grommet 12, and an outer end edge 39 of the fitting surface of the housing body 15 and the lid body 16 between both seal lips 37, 38 is arranged. |
