I don't know in which column I lost my original instrument, but I think there is a black hole. I was forced to find a suitable replacement. It filled the bill fantastically. Ideal for vacuum cleaners and holsters. It's durable enough to withstand the routine contact with other objects when I vacuum carpet edges in bedrooms and kitchens, as well as cat litter spills. 100% satisfied with the price, utility and value of this aftermarket replacement.
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