Jet printer specifications are different and a key difference is in the ink. Manufacturers want it so to enhance and distinguish their product from others. Also universal refill kits have one dispensers for all colors, no gloves, and harmonica squeeze-type dispensers with no way of measuring ink accurately. Equally, harmonica type dispensers are more likely to introduce air bubbles into the cartridge. Because to inject ink you squeeze the harmonica and when you release it and the harmonica extends and draws air inside.
Air bubbles block the ink flow to the printhead.
And yes, beware also of imitations. We have been in this business for 19 years and can give you the confidence inspired by experience and by a large satisfied customer base worldwide. All our products are guaranteed. Should there be a problem we will send a replacement or issue a refund at our discretion. Inc. All rights reserved.