As part of the clearing out of the old A/C components from the cavity where the new tank will go, you also need to make a passage for the new water lines to get to the tank. I found this conspicuous looking sheet metal plate tacked on the main cross-member and discovered that sure enough - this is the passage that was used on the early coaches to get water to & from the lower forward tank. It's a bitch to reach and get opened up so jack the coach high to make it some easier.
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