Those fittings are part of the PCV system. Basically the fittings are a calibrated restriction between the two hoses. There is an opening in the side of the engine block behind the compressor mounting bracket where the front hose attaches. The smaller hose connects to the metal portion of the intake manifold. Great care must be taken when trying to remove these two hoses from the plastic intake. The only proper repair would be to replace the plastic portion of the intake manifold along with the necessary gaskets and seals.
Do it right the first time then you don't have to worry about doing it a second time.

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Mercedes Benz Master Tech - Retired