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I believe that line is a “vent” line from valves, just air and marine a little oil. The line is rated for that. I think I’m fine.Great job on the signature. You want to bear in mind that the hose you use now should be one that is ok with oil traveling thru it. If it is not, while it will work for now, it may come apart quicker than normal oil hose would. I am glad it is working and running fine but I would check on that to be sure.