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Stampede Stills Stainless 3" Sight Glass with viewing LIGHT and tri-clamp ferrule attachment. Stampede Stills
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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
3.9'' Sanitary Sight Glass in-Line Sight Glass End Tri-clamp SS304 w/ Clamp New | eBay
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