Thats your vent tube for the final. It’s not secured well and falls down on most all of them. It’s supposed to run up the rectangular frame tube up high. Just zip tie it better. I added a short piece to mine with a coupling from the hardware store so it was long enough to stick down in the frame tube up high behind the passenger seat, insuring it won’t happen again. If left down at the skid plate it can suck up water and contaminate your diff fluid so check that too and make sure it’s not milky!
It doesn’t connect to anything!