The present invention relates to a fire alarm transmitter installed in a fire hydrant, and more particularly, when the fire alarm transmitter is installed on the upper iron plate of the hydrant, a plurality of fixing pieces are used to drill a through hole in the fire alarm transmitter and the upper iron plate of the hydrant to use the upper iron plate Instead of fixing the fire alarm transmitter to the main body of the fire alarm transmitter, it is combined with a fitting stone formed on the main body of the fire alarm transmitter to facilitate the work process and is aesthetically clean. It relates to a fire alarm transmitter installed in a fire hydrant.
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