I just received my Royal Mail package from GG UK (even though they are no longer a GG dealer) and did a quick comparison of the original Ithaka window and the new Odysseus Upgrade window. See photos below.
Here is the original window I am trying to replace. not sure what liquid was used by previous owner(s), but the tank did not hold up so well...
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Here is a direct side-by-side of the two windows
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Here is the new window on the SN ring
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After installation, the new window will add approximately 2mm to the length and the threads are substantially longer. Due to the longer threads, the SN ring does not seal to the base's o-ring. I estimate I will need to remove roughly 1.5 - 2 mm from the threads for this to seal properly.
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I will post when I have completed this task and how well it worked.
Darkreign