Alec,
You know, I don't actually know whether the 250/350 tanks are different. They could well be, now that you mention it. I've tried a couple of things, and I think the easiest is some kind of flat fiberglas plate under the tank, screwed and RTV'd or something, with a standpipe arrangement six or eight inches long in the middle of it. I'll be thinking about it, certainly.
Vance
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