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Amazon.com: Beduan in-Line Sight Glass with Tri Clamp End, Sanitary Flow Sight Glass Stainless Steel 1.5 Inch Tri Clamp Type (Flow Pipe OD 19mm) : Industrial & Scientific
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