Epson EASY FLOW IV R1900 - Manual (Page 8)

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REFILLING THE BOTTLES
Remove the air filters and replace the
small rubber bungs (that you did not
throw away).
Remove the large rubber bungs
This sequence prevents the chambers
filling with ink.
Refill the bottle through the large
opening.
REPLACE THE LARGE RUBBER BUNG
FIRST!
Then remove the small bung and replace
the air filter.
If this sequence is not followed and the centre chamber is allowed to fill with ink use the
procedure on page 3 to remove the ink.