Weldless Large Sightglass Kit, LTSK For Sanke Kegs, With 3" Dial Thermometer
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