Jeff wrote:
Thanks - this means my tank is 15 inches in diameter. Now I have to
measure the hatch - I think its a tad smaller.

It also means that there's only half an inch of insulation.


Scout wrote:
Jeff,
The dimensions of the galvanized box are 13" high x 13" wide x 16" long
(deep).

There are flanges welded to the tank which extend a further 1.75 inches on
each end (bottom of tank) which make the overall length of the unit 19.5"

The tank itself is about 14.5" long x 12" diameter.
If you have an 11 gallon system, add 3" to each general dimension, making
your unit 16" x 16" x 22.5"

Hope this helps -
Scout

Yep, not a lot of effort went into the insulation.
Scout