Need help identifying missing hose

[stouff93]

I have a 72 911T with MFI and A/C, while changing the oil filter I noticed a connector missing a hose. The area is right above and near the oil filter. I looked at the parts diagram and can't exactly identify the missing hose, is it 901-107-394-04? I looked around the engine and haven't found another connector of the same size. The car is currently jacked up on one side preventing me from getting under the passenger side. Is this some type of breather hose?

Any insight is appreciated. Thanks.

[kodioneill]

breather that connects to the engine breather cover ? maybe.