1" Tri-clover Sight Glass for RIMS tube

I am the in design/purchase part of my RIMS build and was trying to find a way to not purchase from stpats. The only reason why I am considering it is because of the 1.5" tri-clover sight glass. My RIMS tube design is uses 1.5" tubing which should allow plenty of room for my element. Brewershardware sells a 1" sight glass but I am not sure if i will have a clearance issue with my element and the flange wall.

Has anyone incorporated a 1" sight glass into their RIMS tube?

http://www.thevintnervault.com/index.php?p=view_product&product_id=1413

1.5" Tri-Clover Sight Glass Bolt Style $74.99

http://www.glaciertanks.com/TriClamp_Products-TriClamp_Site_Glasses.html

1.5" Installed:

Thanks for the link.
I currently have a 1.5" sight glass on backorder!