SKU:

CS-EP-664-Y

Condition:

New Compatible

OEM Part #:

T664420-S

Color:

Yellow

Volume:

70 mL

Page Yield:

Up to 6,500 pages (ISO/IEC 24712, Epson methodology)

Chip:

None (chipless bottle)

Warranty:

Lifetime Warranty

Returns:

1-Year Free Returns

Frequently Asked Questions

What does this bottle refill?

The yellow tank of any of the eight 664-generation printers: ET-2500, ET-2550, ET-2600, ET-2650, ET-4500, ET-3600, ET-4550, ET-16500. Specs: T664420-S, 70 mL, up to 6,500 pages.

Why do prints go blue-green when yellow is low?

Green is cyan plus yellow. Starve the yellow and greens slide blue, while warm tones — skin, wood, sunlight — lose their warmth. It's the earliest visible low-tank warning on these printers.

My ET-3600 takes a 774 black. Same yellow?

Yes. The ET-3600/4550/16500 split applies only to the black bottle. Their colors — this yellow included — are 664 bottles, per Epson's own Ink Finder.

Is the yield 6,500 or 7,500 pages?

Epson publishes both, on different model pages, for this same bottle. We spec the conservative 6,500 on all 664 products so the claim is identical for every owner; the 7,500 figure is disclosed on the ET-2600/2650 category pages.

What type of ink is in the bottle?

Epson's US documentation for the 664 family doesn't declare an ink type, so this page doesn't either. Code, volume, yield and model list here are all from Epson sources; type is left blank rather than guessed.

Will the printer reject it?

There's nothing to reject: no chip, no electronics. The nozzle either seats on the yellow tank (correct) or doesn't fit (wrong tank).

How is it different from the 502 yellow?

The 502 yellow (T502420) belongs to the newer 502 family — different printers, different keying, 6,000-page rating. This 664 yellow fits only the eight first-generation models listed here.

Can I top up a half-full yellow tank?

Yes — topping up the same family's ink is standard EcoTank practice. Just don't mix families; 664 ink stays in 664-generation printers.

Prints still look cold after a refill. What next?

Run a nozzle check. A blocked yellow nozzle band imitates an empty tank; one cleaning cycle usually restores it. A full tank, clean pattern and persistent fault is lifetime-warranty territory.

How should I store the rest?

Cap tight, upright, room temperature, out of direct sunlight.

Is this a genuine Epson bottle?

No — a Clever Supplies compatible built to the T664420-S specification, labeled compatible on the box and this page.

What cover do I get?

A lifetime warranty — a bottle that fails to perform is replaced — plus free returns within the first year.