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National Vacuum Environmental Services Company

April 2014—National Vacuum Environmental Services Company (a mechanical contractor in Montreal) was contracted recently to perform a freeze seal on a 12” water main in the boiler room of the CBC Building in downtown Montreal. A freeze seal, or “ice plug” was required in order to change out an old valve that was seized up without having to shut down or drain out the system. While National Vacuum has technicians with experience freezing smaller diameter lines, they decided to contact COB Industries in order to purchase Accu-Freeze® equipment and to receive training to prepare them to tackle…

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