Its the exaust
Probably a breather pipe for the front differential.
Engine oil coming from breather pipe
A breather is something you put on your gas tank to let the fumes out. It is the hose coming out of your tank.
The engine blow by is exhaust gasses trough out the breather pipe
To remove the breather pipe on a 1999 VW Polo, first ensure the engine is cool and disconnect the battery for safety. Locate the breather pipe, which is typically attached to the valve cover and the intake manifold. Carefully release any clips or clamps holding the pipe in place, and gently pull the pipe off, taking care not to damage any surrounding components. If the pipe is stuck, you may need to wiggle it slightly to loosen it before removal.
in the breather tube/pipe
under the bonnet!
it is just a breather pipe
On a Ship, the anchor chain is fed through a Pipe called the Hause Pipe.
Diesel coming out of the tank breather pipe on a 1997 non-turbo diesel van may indicate a few issues. It could be due to overfilling the fuel tank, causing the excess fuel to escape through the breather. Alternatively, a blocked or malfunctioning tank vent can create pressure that forces fuel out. Lastly, a faulty fuel cap or damaged breather hose might also contribute to this problem.
Please re post your question. What air pipe,are you talking about the breather vent inside the wall. If you are talking about the breather vent,it is not getting sucked up it is from water being backed up in your drain,and the water can not drain quickly enough, the drain needs to be cleaned.