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square head plug /ˈskweə ˈhɛd ˈplʌɡ/ n

中文：方头管塞

中文 · 方头管塞Español · tapón machoFrançais · bouchon mâle sans bourrelet
Meaning：Cap screwed into the end of a threaded female pipe to close it off.
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Found in these illustrated scenes（1）

Pipe fittings 2

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