Replacement cap for common 5 liter canisters you can find in European retail markets for distilled water or antifreeze agent. The larger version is for rectangular canisters and the smaller one for spout canisters:
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Printed in 0,2mm PLA structural preset.
If tightened enough they seal pretty well, but you can of course also print a sealing with TPU.
The author marked this model as their own original creation.