System Sensor B501 Detector Base 200 SRS Std Plug-In Intel 2-Wire 4" 12/24VDC Fl

System Sensor B501-WHITE 4" Detector Base No Flange White

New System sensor b501-iv detector base b501 iv

System Sensor B501 Plug-in Detector Base

WHEELOCK 103204 SBB-R SURFACE MOUNT RED FIRE ALARM BACK BOX W/ HARDWARE

System Sensor B501-WHITE 4" Standard European Flangeless Mounting Base, UL/ULC

System Sensor P2WL fire alarm horn strobe, white