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Air Vents Vacuum Breaker – No. 26

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Designed to protect closed vessels and piping systems against collapse when the induced vacuum exceeds design conditions. When used on steam heating systems, the No. 26 Vacuum Breaker controls induced vacuum, permitting normal return of condensate to the boiler. Adjustable range 1/4″ to 20″ (mercury) vacuum. Factory set to 4″.

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