Amazon.com: Sight Glass with Adapter-1/2"NPT High Temp Silicone Washers, Quartz Tube Homebrew Kettle Keg Sight Gauge, Directly Replace Old or Damaged Parts (Size : 16 inch) : Home & Kitchen
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Sight Glass | 2.25” - Ss Brewtech
Weldless Flex Sightglass
Stainless Tri-Clamp - 1.5 in. Sight Glass (1 in. ID) – HowdyBrewer
Weldless Large Sightglass Kit, LTSK For Sanke Kegs, With 3" Dial Thermometer
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11"/16"/20" Weldless Sight Gauge Tee Assembly Stainless Steel PC Tube High Temp 7/8"Hole Homebrew Kettle/Keg - AliExpress
23.5 Inch Polycarbonate Sight Glass Beer Brewing Mash Kettle Gauge Cut To Length | eBay