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Watched that late last night. The channel has a lot of thought provoking high speed video. Well worth subscribing to.
I’ve heard that using a 4" union with a 45 deg 1-3/4" clean out plug for the piezo works well. Use a 4" to 2" reducer for the barrel. The unions are one piece made of thicker material than the pressure vessel he has there, and you get a handle, to boot.
Check your local regs, as construction or possession of one of these may be illegal in your jurisdiction.
Ahh my teenage years. We launched all sorts of stuff.
Cantaloupe? That’s about the only use for that nasty fruit that I can see. 
Damn you people and your Youtube Time Wasting ways!!!
dude shoots an ASPIRIN out of the air…
I don’t think I could even SEE the aspirin, let alone shoot it…
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It’s so mesmerizing to watch 
No high speed footage, but still awesome!
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Don’t get me started on another downward spiral of youtube videos of minature engines, which seems to happen every time I go on youtube.