4" ASTRA DRY PRE-ASSEMBLED MODEL B FLANGE/ GROOVE GALAXY FIRE SPRINKLER ALARM VALVE

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