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GL45 cap sealing gasket PTFE sealing ring Silicone sealing gasket Blue cap reagent bottle sealing gasket 42mm PTFE gasket GL45 cap sealing gasket PTFE sealing ring Silicone sealing gasket Blue cap reagent bottle sealing gasket 42mm PTFE gasket GL45 cap sealing gasket PTFE sealing ring Silicone sealing gasket Blue cap reagent bottle sealing gasket 42mm PTFE gasket