I am running the larger 1.8t unit and have been very happy with it. Javad In a message dated 9/9/2001 9:25:48 AM Pacific Daylight Time, charlie at elektro.cmhnet.org writes: << Here's a URL for the FORGE bypass valve I'm using: http://www.stratmosphere.com/forge_valves.htm Pick the 2.7tt model rather than the 1.8t version. It's $139. >>