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7500 VOLTS what is it?

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Insulators316 of 336Heningray InsulatorsLooking for some help identifying..
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    Posted 10 years ago

    flashlarue
    (197 items)

    This "insulator' is about 4 inches tall and is threaded on the outside. It is embossed;
    7500 VOLTS
    PYREX
    T.M.REG.
    MADE IN U.S.A.
    A
    It also has an oblong opening in the bottom.
    What is it and what was it used for?

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