This replacement Redox probe by Zodiac is designed to replace the original probe with reference R0819900 in water treatment equipment. As an essential component of the system, it measures oxidation-reduction potential and regulates chlorine production for optimal water quality. Manufactured by Zodiac, this replacement probe offers perfect compatibility and equivalent quality to the original r0819900, ensuring reliable and durable performance. It is compatible with various Zodiac equipment and regular replacement is recommended for effective water treatment and optimal quality.