title_body: Please Help find Moka Pot Gasket Replacement
upvoted_answer: We can’t give you shopping advice, it will depend on your location through which channels you can obtain a replacement part.
  
  What we can help you with is to determine what size of pot you have - and based on that, you can pick the correct size.
  
  
  First, you can measure the diameter of the “no longer there” gasket, some web shops may actually list that value. 
  If they simply sell by pot size, measure the amount of water that goes into the lower compartment. For my Bialetti models, the three-cup one takes about 140-150 ml, the six-cup around 300-310 ml. That translates to about 50 ml per cup (will be less after brewing, as some water will be absorbed by the grounds).