Q. "I can't see what the functional differences are among the different diverter aerator models?"
A. In all models, including the "with outlet", the left-hand-side outlet is where the water is diverted to. On the ADVSR-1, there is what appears to be two outlets. However, the top is the diverter, the bottom is an inlet and then there is a small spigot just below the two where the water comes back through (this acts as an outlet for the returning water, therefore, it is called a "with outlet".) The ADVS-4 is a swivel (meaning that the top threads will turn separately from the rest of the adaptor). The ADVS-4 and ADVSR-1 both have a pull out button for diversion, and the ADVP-4 is a pull-down model. All come with the most common female aerator threads, which will fit most (but not all) U.S. made faucets that require a female threaded aerator. If you need male threads on your adapter (meaning your aerator has male threads) then you'll need to order the male-to-male adapter (part number #COUNTMALE) and it screws onto our female spout adapter converting it to male. Then the chances are 90% that it will fit.
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