Yes The Curetubes are sealed with a tongue and groove seal. Our lids are manufactured by precision plastic injection machines with pinpoint accuracy to ensure that the tongue fills the groove when snapped shut preventing air to exit or enter.
-The design of our seal is easily cleaned and doesn’t require any additional replacements like a gasket would.
***The Curetube does not have a rubber gasket seal for multiple reasons.
-Rubber gaskets dry out and crack, and need to be replace frequently.
-Rubber gaskets get dirty and are difficult to clean, which can often lead to cross contamination.