drencher

noun

1. One who, or that which, drenches.
2. A fire prevention device, like a sprinkler but ejecting a denser curtain of water and sometimes mounted on the outside of a building to prevent the spread of fire from those nearby.

   “A second system of conventional dry sprinkler heads is interspersed with the drencher heads.”

   “The drencher supply should also be separate from the sprinkler supply.”