I was doing a heater core flush and reassembling everything when I noticed this hose hanging loose. I didn't remove it on purpose and I have a feeling it's been hanging there for a while. No obvious locations to reconnect it. Looks like it might be a vent hose for the battery? I have a Delco battery now and I don't even remember seeing a connection on the battery for a hose. Any thoughts?

 

Yup, it's the vent hose. Just tuck it in close to the battery if there is no recepticle on the battery