INKUTEN Set of 4 Refill Eco tank Ink Kit 140ml BLK 70ml CMY for T502 and Expression Ecotank ET-2700, ET-2750, ET-3700, ET-3750, ET-4750 Printers Comes with especial cap that fill directly to the ecotank. Cartridge number: T502120-S T502220-S T502320-S T502420-S For Expression ET-2700, ET-2750, ET-3700, ET-3750, ET-4750 Printers 4 Pack Refill Ink Kit --- 1BK+1C+1M+1Y, 140ml/ Black and 70ml/ Cyan Magenta Yellow. Regular refill bottle for an easy using. Clogging free, Wide color gamut with brightest and Vivid colors. Perfect printing stability and safety.