Originally Posted by aeviaanah
This is a great idea man. I may do something like this for my sanke keg which is in the process of being modified for boil pot. You buy the sight glass assembly from Mc master as well?
I bought the original sight glass assemblies from brewershardware -- it's this one: https://www.brewershardware.com/TC10SG.html
However, what I'm thinking is more cost effective is to take an existing TC 90 as-is ($13) + a stainless flange of the right dimensions. The tri-clamp face becomes the seat for the silicon washer and tube and the hole in the flange captures the washer/tube. McMaster has flanges, but they are absurdly expensive and not the right size.
The outside diameter might need to be tweaked to make sure the nuts clear the welded flange when assembled -- but it's pretty close.
The 1" triclamp has about a .86" ID hole and 1.984" outside diameter on the flange. The idea is to either a 1" or 1 1/4" heavy wall tube like this: http://www.chemglass.com/product_view.asp?pnr=CG-703
. Ultimately, the hole in the flange depends on the silicon washer you use -- I can't seem to find stock ones yet and a washer with extra clearance requires less accuracy than an oring in the fittings.
flange + washer (orange) + tube (blue). Not showing the tri-clamp elbow that would be welded on the back.