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Low profile sight glasses

Posted: Mon Nov 04, 2024 2:05 am
by Black Bull
I'm slowly collecting parts for my next build and I want to utilize some sight glasses.
Ideally I'd like them around 4"
BUT

I dont want them sticking out like these
Screenshot 2024-11-04 at 20-00-54 1pcs 25mm-108mm Sanitary Sight Glass Diopter Stainless Steel SS304 Circular Viewing Sight Glass - AliExpress 13.png
Has anybody used something similar to these and welded or soldered the flange in ?
Screenshot 2024-11-04 at 20-02-55 ISO63_80_100 vacuum Viewports SS304 NW63 flanges sight glass ISO-LF flanges viewport ISO inspection glass SS304 vacuum viewport - AliExpress 13.png
Failing that, any other suggestions ?