I just got the '08 3490BHS with the new winterizing valve setup behind the ODS basement door. The W/H bypass valve is here (handy!) but there is another "winterizing" valve plus a clear hose with what looks like a push-on fitting. What does the other winterizing valve do? What is the hose for and where do I get a fitting for it? Does it intake antifreeze? My dealer appears to be stumped by this (of course they are also the ones who told me on delivery that the vent in the basement "is absolutely not heat ... it is just a safety vent for the converter" when I knew all along from factory materials that it is precisely a heater vent). The book that came with the FW does not mention any of this new (and apparently wonderful) plumbing control center.