... 2", DN20, 3/4 fire sprinkler,sprinkler head,fire nozzle1.ZSTZ-68oC to be installed upward, 2.ZSTX-68oC to be installed downward ... ,3.ZSTBS-68oC to be installed in wall-mounted horizontal way,4.ZSTB-68oC ... to be installed in sidewall way,5.ZSTP-68oC , upward or downward. ... , flow coefficient 115,rated W.P. 1.2MPa. fire sprinkler