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Inside PvC pipe, doesn't it have to have holes in it? To allow the escaping gas too expand into the second chamber. Answered

Regular firearms work on a simular principle and size matters. 9 holes 1 inch apart, 4 lines of them. or make the inner tube out of screen. Mom & dad will love that one.

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Tombini

9 years ago

What are you talking about? Fireworks? I'll try to help, but what are you on about?