Abstract: A dry sprinkler comprises a tubular body having a connector and a sprinkler head. The connector is adapted to be connected to the water pipe network of the fire suppression system and the sprinkler head is adapted to discharge water or other liquid suppressant. The tubular body defines a flow passage between the connector and the sprinkler head. First and second seals are arranged in spaced relation along the flow passage and contain an antifreeze fluid therebetween. The antifreeze fluid may be a liquid or gas subjected to pressure. A thermally responsive element is arranged to maintain the second seal in a state that contains the antifreeze fluid between the first and second seals. The thermally responsive element releases the second seal when an elevated temperature condition exists.