We need to seal the end of this pipe.
noun
rank and file; lower levels of an organization
Used for the people or parts of an organization that are farthest from the center of power or decision-making. Often implies a contrast with the leadership or headquarters.
末端の社員まで方針を徹底させるのは難しい。
It's difficult to make sure the policy reaches even the rank-and-file employees.
末端の声を経営に反映させるべきだ。
We should reflect the voices of the lower levels in management.