Delta RP74130SS Stainless Aerator . Delta is one of the industries leaders in manufacturing kitchen faucets, bathroom faucets and shower systems designed with innovations that satisfy people's needs. Delta Stands behind their quality products with a comprehensive warranty, and offers an extensive collection of replacement and repair parts ideal for continuous performance. The Delta RP74130SS Stainless Aerator is a genuine replacement part designed for 21987LF & 21988LF kitchen faucets. This replacement part comes in a stunning stainless finish.