@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).
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 hands lol) then use a wrench to turn it just a little more snug.