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Amazon.com: MECCANIXITY PTFE Gasket Flange O-Ring for 6 Inch Vacuum Clamp, White Pack of 2 : Industrial & Scientific
Amazon.com: DERNORD Teflon (PTFE) Tri-Clamp Gasket O-ring - 2 Inch Style Fits OD 64MM Sanitary Pipe Weld Ferrule (Pack of 20) : Industrial & Scientific
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uxcell 35mm x 24mm x 4.2mm NBR PTFE O-Ring Piston Seal: Amazon.com: Industrial & Scientific
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PTFE 24/40 to KF25 Flange Adapter with Viton O Ring Bore 13mm at USA Warehouse: Amazon.com: Industrial & Scientific