The 21C Series heavy duty faucet is a culmination of Delta’s design innovation and engineering expertise. Styled after Delta’s popular Synergy® series, it features seamless one-piece cast brass construction to prevent bacteria and dirt build-up. The 21C is equipped with Delta’s own 1/4 turn CER-TECK™ ceramic disc cartridge. With one good turn after another, the 21C Series faucet delivers performance and reliability in any environment.