Dual channel connector units, devices, methods, and systems including the same

A connector unit comprising:

• an inlet passageway and an outlet passageway, the inlet passageway comprising a first proximal end and a first distal end and the outlet passageway comprising a second proximal end and a second distal end;
• a second connector portion comprising a first body comprising an outer surface and a first passageway;
• and
• a fourth connector portion configured to be inserted into the first passageway, the fourth connector portion comprising a second body comprising a wall having an inward facing surface an outward facing surface, and an end surface defining said second distal end of said outlet passageway;
• wherein:
• at least a portion of the inlet passageway is disposed in the fourth connector portion;
• at least a portion of the outlet passageway is disposed between the outer surface of the first body and the inward facing surface of the second body, such that at least a portion of the outlet passageway is disposed radially around the inlet passageway;
• the fourth connector portion further comprises self drilling elements that are integral with or coupled to the end surface of the wall of the second body;
• and
• the connector unit is configured to be installed into and span a portion of a compartment such that the first and second proximal ends are located outside the compartment and the first and second distal ends are located inside the compartment when the connector unit is installed.