A Dry goods funnel, this model was designed to fill a "standard" PET Coke / soft drink bottle with dry goods, for example:

• Desiccant beads
• Fish food
• Seeds
• Sand?

Let me know what you use it for 😉

The funnel's bottom is the same width as the bottle top allowing solid items to pass through as easily as possible.

The funnel could be used for liquids in the absence of something better but that was not the design intention so some leakage may occur.

Derived from PET Thread being public domain it probably does not need to be referenced but it would be still be interesting to see all the things created from it.