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TYCO 517.050.042 / 4B-C Continuity Detector Base for 800 Series of detector
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TYCO 516.850.055 / 851PH Optical smoke/Heat detector (Marine only)
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517.050.023 MUB5EX Detector mounting base, 5" 600EX/800EX, IS
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801PHEX IS OPTICAL/HEAT - TYCO, P/N: 516.800.530