I have seen some where the 'BD' looked like a 5 gallon paint pot with the outlet part way up the wall, this might amount to your sump. Others have looked like they were more or less one of the tank connectors on the following page http://www.koicarp.net/pvc_plumbing/connectors.html
Posted on Jul 18, 2005, 4:47 PM from IP address 84.67.240.115