I asked the seller before buying and he was told these jars will fit Rotopax jars. KEEP IN MIND! they are NOT suitable for Rotopax containers! These caps are too small to fit, it's not just the threads. I've had enough of both my current (2000) water can and 2018 gas can with the same result. I can't comment on the overall durability of the product as it's not even fit for purpose.
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