I recently purchased a kegging kit from AIH, and I had a question about the co2 tank. I went to my local brew shop today and exchanged the tank that came with the system since it was empty, and I don't seem to be getting any pressure out of the new tank. I'm just wondering if the lady there gave me an empty tank on accident? I looked at every video I could find, as well as read up on it, and I'm pretty sure that I have everything hooked up right. Even if I open the pressure without anything attached to the tank, nothing happens. I've obviously never used a kegging system before, so I feel like I might be missing something simple. Thanks.