... plating 2.DN15, 1/2", DN20, 3/4 fire sprinkler,sprinkler head,fire nozzle1.ZSTZ-68oC to be installed upward, 2.ZSTX ... be installed downward,3.ZSTBS-68oC to be installed in wall-mounted horizontal way,4.ZSTB-68oC to be installed in ... R3/4, flow coefficient 115,rated W.P. 1.2MPa. fire sprinkler