Most ink cartridges come equipped with a fill hole from the manufacturer and in many cases it's just a matter of removing a plug from the hole and replacing it after refilling. Some other cartridges require drilling a small hole in the casing and using a plug to seal it. Plugs and tools are supplied with InkBank refill kits, but if you need more, find them here...
Note: Not all ink cartridges require re-sealing the fill hole. If you are using an existing hole (eg breather vent), don't seal it or the cartridge will not work.
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Plug for Canon #520/521/525/526 tanks
Clear silicone plug for sealing Canon PGI-520/525, CLI521/526 (and similar) genuine ink tanks Special low profile plug prevents interference in late model Canon printers.