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What are these please?

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meloz

meloz

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236218104_836988890328621_6734951872937480787_n_flacc5.jpg



Does anyone have any idea what these are. Drilled and inserted to a new concrete road in South East Asia?
 
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Look like zerk-type packers for injecting polyurethane under slabs for mud-jacking (or void filling).
 
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Thank you, makes sense.
 
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