4 in. Square Headguard Water Shield facilitates timely activation of pendent fire sprinklers by shielding them from water spray from higher elevation fire sprinklers. Used in rack storage sprinkler installations, this headguard currently has a hole for 1/2 in. (5.6K) fire sprinklers and can be drilled larger to fit 3/4 in. fire sprinklers (8.0K). For a complete rack-storage impact and water protection solution, purchase with our chrome fire sprinkler head guard (HG0C1PC), or our red fire sprinkler head guard (HG0R1PC), or if you prefer to choose from all our headguards, click here to view our full selection of headguards.