Front air ports on '04 Inspire

[chuydog]

Right below the driver side headlight and just below the bumper are three identical ports which when opened compressed air escapes. I understand that a heavy tow truck would connect to one of these to utilize the coach brakes in the event of a tow.

Why are there three and what do each of them do?

Thanks

[JohnFreyja]

They are there so you can periodically test for moisture in your air lines. Open each for a short blast to see if any water spits out. If it does you need to check the air dryer/filter system.