A320 mystery vent?

[Dream Land]

Can someone please identify the opening above and to the left of the drain mast located on the AFT RIGHT fuselage of this A320?



http://i63.photobucket.com/albums/h159/180MPH/Screen%20Shot%202015-04-23%20at%208.44.44%20PM.jpg (http://s63.photobucket.com/user/180MPH/media/Screen%20Shot%202015-04-23%20at%208.44.44%20PM.jpg.html)

[grounded27]

HAHa, stand in front of it the next time someone flushes a toilet. Your mystery will be solved.

[Dream Land]

Was not aware of any waste going overboard, do you have any more information?

Water leaks from the drain mast which is from the sink, never saw anything leaking out of this round hole?

[CCA]

Vacuum pump exhaust, for air not liquid.

[Dream Land]

Thank you!

[Uplinker]

However, some 'liquid' sometimes gets through, leaving brown drips and streaks from these vents........

[Hoangminh90]

Is this the vacuum work only below fl160
Right ?

[mr.newfy]

uses diff press above this flt lvl and a vacuum generator below.