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[โ€“] 17 points 2 years ago* (last edited 2 years ago) (5 children)

S-trap / P-trap (Eg in sinks and toilets)

And zip ties ๐Ÿ‘

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  • [โ€“] 8 points 2 years ago* (last edited 2 years ago) (3 children)

    Pretty much anything with an interplay of water and air pressure fascinates me. Someone else mentioned siphons. I'll mention diving bells and bongs.

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