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if you're close, you can try an offset flange adapter.

http://www.terrylove.com/images/offset_level_fit_flng.jpg

The old Gerber was literally jammed up against the wall...the tank cover would not go on correctly.

When I looked at the published measurements of the Drake I assumed that it was maybe a 50%...

to save a few $$, we went with two ADA height, two regular.

The two bathrooms the kids tend to use are regular height, grown-ups get ADA height.

Installed these back in January 2009, to replace...

I've used Trend for many years and lately I've found that it's not very effective. I've had good luck with PC Tools 'Spyware Doctor' and purchased it after my wife's PC had a bad bout of 'Vundo'...

I see that I can buy Studor AAVs at one of the big-box stores. As long as mine are threaded on, I'm gonna swap them out to be safe. $22 each.

Thanks for the reply.

unfortunately, from what I've seen, the Vespin or Carlysle have 10" models, but they're not ADA..though could be wrong.

The only ADA/10s are three commercial gravity-flushers from Toto:...

When in doubt, install a standard cast-iron or adjustable closet-flange riser. You can get away with being a little crooked, but being too short is never good. (there's some sort of a joke there).
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I recently moved into a newer (1997) house which has at least six or seven air-admittance valves. There's one under the sink in the kitchen, one in the (main level) laundry room, one under the sink...