Expression ET-2550
The Expression ET-2550 refills with 664 bottles across the board — black (T664120) up to 4,000 pages and the three colours up to 6,500 pages each, all in 70 mL bottles. Below are Clever Supplies compatible 664 singles and the 4-bottle set, keyed for the ET-2550 and backed by a lifetime warranty.
| Bottle | Type | Color | Approx. Yield |
|---|---|---|---|
| Epson T664120 (compatible) | Ink bottle, 70 mL | Black | 4,000 pages |
| Epson T664220 (compatible) | Ink bottle, 70 mL | Cyan | 6,500 pages |
| Epson T664320 (compatible) | Ink bottle, 70 mL | Magenta | 6,500 pages |
| Epson T664420 (compatible) | Ink bottle, 70 mL | Yellow | 6,500 pages |
| Epson 664 Set of 4 (compatible) | Full bottle set | Black / Cyan / Magenta / Yellow | 4,000 black, 6,500 per color |
ET-2550 Ink Bottles — 664 in Every Tank Epson's ET-2550 documentation repeats the family reference spec word for word: a box with one 664 bottle per colour (70 mL), and Replacement Ink 664 with Black at 4,000 pages and Colour at 6,500 (ISO/IEC 24712, Epson methodology). Our product pages use these conservative family figures.
Keep this model on the correct side of the generation line: the ET-2550 takes a 664 black. The 774 black bottle belongs to three specific later models (ET-3600, ET-4550, ET-16500) — not to this one, whatever a marketplace listing suggests.
Order singles as tanks fall or the set for a full reset; lifetime warranty and 1-year free returns apply either way.