"Outside funnel" -- funnel that goes over, not inside

For really narrow openings, adding a funnel to the mix can restrict the passage too much.  These funnels fit over the opening, not inside.  There's a little lip so that the narrowest part of the funnel ideally matches the walls of the opening, and the funnel does not slide down the tube.

I designed these for use in flameworking, where we often need to get small stuff inside small tubes (frit, opals, etc).  Ideally quickly, and without spilling them everywhere.

4 designs available, trying to cover the most common-size blowtubes.  If your tube is in between somewhere, the next size up is likely to work for you.