I can't figure out if I have a unique and good idea or if I just missed the bus.  My guess is I missed the bus a long time ago, but that won't stop me from throwing this nugget out there.  I finally replaced the mercury bubblers in my research lab.  It was time.  I have had people say they use oil bubblers.  I tried that for about a day and really hated the lack of pressure that I was so accustom to.  I had to find another solution.  That's when I found Inert Relief Valves (20 PSI) from Cole-Palmer.  I am sure there are others out there, and I get no money from Cole-Palmer, they just h