Quote Originally Posted by SkyWalker View Post
o.k lol, so they do exist bigger than 1 1/8" (28mm). what about the install i have been asked to do, any opinions?, essentially the sight glass will be installed horizontally above the horizontal liquid line.
I don't have opinion since I did not ever done or see that.


You did not looked carefully. Model 3780 is brazed direct on pipe. Just drill hole in pipe and braze sight glass.