Delta RP74812 Trinsic O-Rings. 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. These Delta RP74812 Trinsic O-Rings are genuine replacement parts designed for R4700-FL Floor Mount Tub Filler Rough-In Kits.