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The4" Knox Storz Lock® is operated with a Knox FDC Wrench controlled by the Fire Department
Fire valve wheel wrench grip the rims of hand valve wheels securely and provide leverage for opening and closing
User must have sufficient water pressure for the 90 GPM version to project maximum stream distance
Not intended for use as a fire hose
Knox Box FDC Lock 2 1/2" NH/NST Male Locking Cap Model:3120 (6.0 TPI x 3.250 OD) The4" Knox Storz Lock® isThe 3110 model with 2" NH threads (7. 5 TPI x 3. 068 OD) is the most widely used configuration however, thread patterns and sizes vary by jurisdiction, so always verify the correct specifications with your local fire department before ordering. Knox FDC Locks protect fire department connections (FDCs), keeping pipes clean of debris to ensure the delivery of high pressure water flow to fire sprinkler systems. The Knox FDC Lock is available in 2 1 2"