6 Inch Diameter Sight Glass with Tri-Clamp Ends - Mile Hi Distilling
Amazon.com: DERNORD Tri Clamp In-Line Sight Glass with Flow Sanitary Straight Sight Glass SUS316 1.5 Inch Tri Clamp Clover Type (Flow Pipe OD 38MM) : Industrial & Scientific
Amazon.com: Beduan in-Line Sight Glass with Tri Clamp End, Sanitary Flow Sight Glass Stainless Steel 2 Inch Tri Clamp Type (Flow Pipe OD 51mm) : Industrial & Scientific