Epson EcoTank Photo ET-8500 Wireless Color All-in-One Supertank Printer - Manual (Page 227)

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5. Insert the ink bottle into the filling port and wait for the ink to fill the tank. Do not squeeze the bottle.
Ink flows into the tank and stops automatically when the ink is filled to the upper line.
Note: Refer to the color-coded sticker on the ink tank unit to identify the color of each tank. Do not
force the bottles into position; they are keyed for each color.
Note: If ink does not flow from the bottle, lift and reinsert the bottle.
6. When the ink tank is full, remove the ink bottle and securely close it with the cap.
Note: If any ink remains in the bottle, store the bottle upright for later use.
7. Close the ink tank cap.