They could say something like "this connector contains a spring which will wear out even though the product still looks ok. When it starts to leak for this reason you will need to buy a replacement." This may all be academic, because I can't remember a time when the old one didn't leak.
On a similar subject, what does lifetime guarantee mean? Your lifetime? If it's the product's lifetime, that's meaningless and anyway who's going to keep receipts for their lifetime just in case.
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This may all be academic, because I can't remember a time when the old one didn't leak.