[davepl]

When I was assembling my AC system I took the dryer out of the box; it was capped on both ends with plastic caps. When I took them off, there was clearly a vacuum inside.

Anyhow, it's now connected but the lines are not, meaning its been exposed to the atmosphere for months. Is it useless now, and do I need to replace it?

I'm not sure if its a dessicant I dry out or what's in there... I don't know a great deal about AC.

Thanks!
Dave