4" dia Rubens Tube 100mm speaker driver adaptor

Make flames react and "dance" to music with a Ruben's tube!
This part allows you to mount a 100mm audio speaker driver to the end of a 4" metal vent pipe for use with a Rubens tube.
The rubens tube creates a pressure wave within a tube full of propane or LP gas (modulated from any recorded audio source - like music) which causes flames to dance and react to music playing through the speaker.
For more info check out this WikiPedia article: https://en.wikipedia.org/wiki/Rubens%27_tube