Absolutely Hooters will fit on to most 500ml, 1 ltr and 2 ltr bottles.
When filled with ink or watered down paint you can work on either upright surfaces or flat.
Because of the angled hooter, there is flexibility to use this tool for upright wall works.
In these instances the bottle can be squeezed to force more paint through the tip.
Be sure to clean the cap well after use.