We are trying to fix this ourselves. We had some weird weather and the pipes froze (unusual for our area). Does anyone know what part this is? We replaced one brass on/off valve but now we found another crack/leak in the big whatever-it-is. Is this fairly easy to replace? Is there an online store or ebay that sells this part? Any help will be appreciated....thanks in advance! [attach]49[/attach] [attach]50[/attach]