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Many manufacturers make a budget version of a component, and also offer a higher priced version. The important fact to remember is that the two components may look alike, but will definitely have a different part number. If the part number was not different it would be impossible for the manufacturer to maintain any type of reliable repair and warranty program.
Where the confusion comes is that consumers do not always have the exact part number of the plumber-supplied part vs. the big box part, and from the outside the two parts may look identical.
Manufacturers sometimes add to the confusion by selling the same product with multiple parts numbers, often just to know which retailer sold the product. One retailer may then offer a different warranty or repair program.
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