The ConcealerPlus 11.2 KFactor 16ft x 16ft (4.9m x 4.9m)& 18ft x 18ft (5.5m x 5.5m) Coverage QuickResponse Sprinkler Application Model G4 XLO QREC/EC is the most versatile extended coverage sprinkler available. The Model G4 XLO QREC/EC ConcealerPlus provides the best form of fire protection for light hazard occupancies by offering attractive appearance and ½ (13mm) of cover adjustment for ease of installation. The small diameter Push-on/Thread-off cover plate assembly is easily and positively attched and blended into the ceiling, concealing the most dependable fire protection available, an automatic sprinkler system.