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Chemglass CG-3055-05, PTFE Support Ring, White, 3.5" ID x 5.45" OD x 1.2" Height: Amazon.com: Industrial & Scientific
Sterling Seal and Supply ORTFE226 Number-226 Standard Teflon O-Ring, Outstanding Weather Resistance, Polytetrafluoro-Ethylene, 2" ID, 2-1/4" OD: Amazon.com: Industrial & Scientific
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Amazon.com: DERNORD Teflon (PTFE) Tri-Clamp Gasket O-ring - 2 Inch Style Fits OD 64MM Sanitary Pipe Weld Ferrule (Pack of 10) : Everything Else
PTFE 24/40 to KF25 Flange Adapter with Viton O Ring Bore 13mm at USA Warehouse: Amazon.com: Industrial & Scientific