A sprinkler system in which all piping and sprinkler heads, at all times, are filled with water under pressure; the system discharges immediately when a sprinkler head operates, and the water continues to flow until the system is shut off.
A sprinkler system in which all piping and sprinkler heads, at all times, are filled with water under pressure; the system discharges immediately when a sprinkler head operates, and the water continues to flow until the system is shut off.