The main benefit of the ceramic-sealed cartridge is durability, ergonomics and safety during use. These parts are part of the replacement stock and are purchased to convert the docol rotary pressure register, to a more modern ½ turn system. With this product, its installation has more resistance and allows the installation of lever finishes, making the drive more ergonomic and durable. The cartridge is only compatible with Docol pressure registers, regardless of whether they measure ½” or ¾”.