I mostly use HP 11 but the new 88 cartridges have a dual color print head. I thin it's like yellow/black and magenta/cyan. Pretty crummy they took a step back but I guess they figured they had to inconvenience us refillers.
Anyways I noticed. Unlike HP 11 print heads that only have 1 hole on the top (I'm almost possitive that the little plug is like melted shut). The HP88 print heads have 4 holes. 2 of them are just like the HP 11 where they look like they are melted shut, but the other 2 holes look like rubber beads that you might be able to take out with a thumbtack like you do when refilling the cartridges.
My print heads are brand new so I didn't want to experiment on them until they were empty.
Anyways I noticed. Unlike HP 11 print heads that only have 1 hole on the top (I'm almost possitive that the little plug is like melted shut). The HP88 print heads have 4 holes. 2 of them are just like the HP 11 where they look like they are melted shut, but the other 2 holes look like rubber beads that you might be able to take out with a thumbtack like you do when refilling the cartridges.
My print heads are brand new so I didn't want to experiment on them until they were empty.