In the product listed on the second link it appears that both, or either, the entire stainless steel drain can be unscrewed from the nylon elbow, as well as the center stainless steel plug can be unscrewed as well. As opposed to the product listed in the first link, it appears that it can only be disassembled in one spot. It would be kind of nice to just unscrew the center plug and clean any debris out of it, or whatever else you needed to do as opposed to separating the entire assembly. That being said, it's also $72.95 per unit, as opposed to the first product listed that is $54.95 for the "Complete Set". Whether that means just one total set that includes both pieces or two sets that include both pieces? I'm not positive.