The trans vent is attached to the clamp for the battery and when I bought a new battery it came with a short tube and an adapter to be used in some cases and I figured this was a case of new emission control so I hooked them together and then found out here that the vent connected to the battery clamp is a trans vent. The trans vent is ended within a few inches of the battery vent. The battery has a single vent that points right at the trans vent ann is very close.

1998 Black SE Contour Sport V6 2.5L DOHC Automatic, Moonroof, CD Player