Delta RP41673SS Stainless Aerator Assembly. Delta's Line of Commercial Products are an industry leader in the Bathroom Faucets, Shower Fixtures and Bathroom Accessories. The large line of Commercial Grade Replacement Parts are designed to withstand the every day wear and tear, and perform the way the original part was intended too. These products are ideal for hospitals, schools, and other high traffic and high use applications. This Delta RP41673SS Stainless Aerator Assembly is a genuine replacement part designed for 21966LF Two Handle Washerless Kitchen Faucets.