Step 1: The launcher
- One 1/2" four-way fitting (all fittings are of the slip variety)
- Two 1/2" end caps
- One 1" coupling
- One 1" by 1/2" bushing
- One 1/2" 45-degree elbow

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BG
Great idea and nicely prepared Instructable.
Thanks!
With or without, though, they look like great fun and I wish I'd had something like this around when I was little!