shut off valves the heating main manual valve pipeline trunk selective focus |
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| navigate by keyword : valve pipeline heating main supply duct thermal pipe industry hot water system steam metal insulation conduit steel outdoor urban equipment old line infrastructure transit transmission structure transfer plumbing transporting communication central municipal stream blurred outside winter snow aqueduct nut shutoff rusty hand |
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| Shut-off valves on the heating main. Manual valve. Pipeline trunk. Selective focus. |
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