One that sells carpet installation materials, to be exact. There is a product that is used to fill the gap where one section of flooring ends and another, such as door thresholds. It's made of a rubbery plastic, and is available in a variety of colors. From the end view it has a 'T' cross-section with a crowned top; the crown is about an inch wide; the upright leg goes down into the gap. I'd tell you the name of it but I don't remember; just used a bunch on a new floor project.
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