While regenerating cartridges 6614 / 51626 / 51629 for the HP printers many people try to open the passage in the nozzles applying a deobstruent fluid inside the cartridge and then siphoning off its remains through a head. A good method of applying he fluid inside (and thus a bottom scavenge of a cartridge) is a removal af a cover from the spherical valve (in the bottom of a cartridge).
Unfortunately this part may be damages on execution of this operation. The solution that our company offers you is a Mazehole Label that we install (stick) instead of the old one.

Application-specific for regeneration of ink HP cartridges 6614 / 51626 / 51629.