4" ASTRA DRY PRE-ASSEMBLED MODEL B FLANGE/ GROOVE GALAXY FIRE SPRINKLER ALARM VALVE A dry pipe sprinkler system is one in which pipes are filled with pressurized air or nitrogen, rather than water. ... Located in a heated space, the dry-pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate. Once this happens, the air escapes and the dry pipe valve releases. MADE IN CANADA
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