Is this ink different from the T664 or it is just the size that changes ?

Incorrect Nate from Florida. I received the chart from Epson for EcoTank Printers, listing color ink type and black ink type for several printer models. 664 in is ALL DYE ink to include black. From the chart of EcoTank printers (printer models) that have PIGMENT inks are: R4640 (both color and black R12); 3600/4550/16500 (back only 774); 2700/2750/3700/3750/4750 (black only 502); 7700/7750 (black in 512 PIGMENT & PBK 512 (DYE). Additionally, ALL EcoTank printers for color ink are DYE with the exception of printer model R4640 which is PIGMENT that I previously listed. I'll attempt to load the chart to the main comments on this product site.

Is 774 black ink compatible with the ET-2550 series?

I have been using the 774 ink with the ET-2550 printer, with no problems, for two years.

Can this ink refill be used in the Epson ET-3760?

Check with Epson..I use 774. ed

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🖤 Print smarter, not harder — stay stocked and sustainable!

COMPACT CONVENIENT - Slim 6.5-inch bottle fits easily in your workspace for quick, mess-free refills.
ECO CONSCIOUS CHOICE - Designed with recycling in mind to reduce landfill waste and support sustainability.
SEAMLESS COMPATIBILITY - Perfectly engineered for Epson EcoTank ET-4550, ET-3600, and ET-16500 models.
PRINT MORE REFILL LESS - Ultra-high capacity bottle lets you print thousands of pages without interruption.
CONSISTENT PROFESSIONAL QUALITY - Pigment black ink delivers sharp, crisp text and vibrant everyday prints.

The Epson 774 EcoTank Ultra-high Capacity Black Ink Bottle (T774120-S) offers thousands of vivid, professional-quality prints with pigment black ink. Designed for EcoTank ET-4550, ET-3600, and ET-16500 printers, it features a compact, easy-to-use bottle that encourages recycling to reduce environmental impact.

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Manufacturer	Epson Consumables
Brand	Epson
Item Weight	6.8 ounces
Product Dimensions	2.4 x 2.4 x 6.5 inches
Item model number	T774120-S
Is Discontinued By Manufacturer	No
Color	Pigment Black
Number of Items	1
Size	Ultra-high Capacity
Ink Color	Black
Manufacturer Part Number	T774120

Epson 774 EcoTank Ink Ultra-high Capacity Bottle Black (T774120-S) Works with EcoTank ET-4550, ET-3600, ET-16500

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