The Navien GXXX001178 is a quick install manifold kit. It is for use with Navien CH combi boilers. This manifold kit replaces a hydro tee and is necessary for primary-secondary piping in Navien CH combi boilers. With primary-secondary piping you can prevent water from entering a circuit that is off. The primary-secondary piping provided by this kit also ensures an optimal flow rate for your combi boiler.
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