“I just bought et-2750 printer but when it's time filling for the ink I can't find the "small cap" where I can rotate the small lock to open the ink tank cover up.”
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All I had to do was open the bottle, and flip it upside down into the tank filler... No turning or additional caps. Once contact was made it sealed and started filling till it reached the top. Hopefully you figured this out by now.
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