CISS DIY kit for HP and Cannon cartridges. Turn your cartridges into Continuous Ink Supply System. HP21/22, 22/56, 27/28, 56/57, 92/93, 94/95, 94/97, HP74/75 HP350/351 Specially designed for HP printer cartridges Saving money by making your own CISS system Build a CISS system for hard-to-find models Generic design, compatible with most of brands