Is what they used to call this one.
You stick a joint in the mouthpiece and light it. Screw it back on. Then you cover the vent hole with your thumb and squeeze to make a nice thick shotgun. Take your thumb off the vent while you release your squeeze to keep the joint lit and squeeze again.
Yes! Massive nose hits that go right to your head!
I had a little side biz making a version of these out of old chem squeeze bottles and used glass eye droppers I would get from work. I’d grind the skinny end off the eye dropper using diamond grinding wheels I had access to there. I have to modify my filter a tad to make it fit in the stem of this. I tried to use my tubing flange tool on it but it didn’t do anything. I would like to replace the stock stem with something of a larger diameter.