Frank - my Tower recipe and instruction book covers the model 2602. The part number for the gasket is given as 101003 and the same gasket appears to have been also used in models 2601, 2603 and 2604. As far as I am aware this gasket has been obsolete for a few years now. I had a similar problem as I wanted a replacement gasket for our model 2600 which is also obsolete. After a few months I was able to find one for sale on eBay but that was about two years ago.
I wish you luck.
Alan.
Alan Vickers
December 2008
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