I've got someone that needs a tank lid seal for a 121. I am not very familiar with the stove and have not seen one before. I think the lid seal dimensions are slightly different than the Svea 123 but was wondering if a 123 seal would work on the 121 cap. The seals I currently have for my 123's are about 18mm OD (3/4 inch), 9mm ID and 2mm thick. Scott
Hi Scott. Yes the Svea 123 washer will work. You can order more great viton rubber seals from Spiritburner if you want. Cheers, Jeff