title_body: New Regulator = Air in my Beer LInes?
upvoted_answer: the bubbles are most probably just CO2 coming out of suspension. This can be due to temperature diffences between the beer and the beerline, or because of something causing the agitation (dirt in the beerline).
  
  If the beer is overcarbonated this will happen quicker. Try to get the beer &amp; beerline at the same temp, or get the beerline even colder.