We designed it so a flexible tubing with a 25mm outside diameter can be inserted directly into the frames. If the tube has a 2mm or more wall thickness, this will sufficiently block the honey leak back point if inserted all the way.
We designed it so a flexible tubing with a 25mm outside diameter can be inserted directly into the frames. If the tube has a 2mm or more wall thickness, this will sufficiently block the honey leak back point if inserted all the way.