@krunch, fwiw the 2" columns can be blasted out with a air compressor and valve, potato gun style.
http://www.glaciertanks.com/TriClamp_Sight_Glasses-Sight_Glass_2_Processing_view_TriClamp.html
We may have to buy a special tool to take it apart and replace the silicone lower gasket with viton (or reccomended).
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Im aware, dont have an air compressor though..
Thanks!
Nah, once you clamp it down you can take it off by hand. If anything a large pipe wrench will grab those teeth just enough to help you break it loose. I just hand tighten these down as much as i can(Small guy ~ 150lbs with small handslol) then use a wrench to turn it just a little more snug.