The Navien GXXX002212 Residential Neutralizer Kit is a condensate treatment component designed for high-efficiency Navien tankless water heaters and compatible condensing heating equipment. It works by directing acidic condensate through specialized neutralizing media, which raises the condensate pH before discharge into the drainage system. This helps reduce corrosion of household dr... https://www.partshnc.com/navien-gxxx002212-neutralizer-kit