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