Adopting "German JOB" imported glass bulb, metal seal cushion, this is high standard and high quality series sprinkler; When the system is a dry system or a pre-acting system, the water in the nozzle and the body of the ordinary sagging sprinkler head cannot be emptied. When the ambient temperature is below 0°C, the water and condensate will freeze and expand, causing irreparable damage. Dry pendent sprinkler head, the sealing part is located at the top of the installation pipe, the whole connecting section is empty pipe, fundamentally avoid water and condensation caused by freezing. Designed for use where the sprinkler head or connecting piping may be exposed to low temperature freezing or where the sprinkler system requires seasonal emptying.