30026576B - Primary Manifold Kit - NCB and NFC SeriesNavien 30026576B Primary Manifold Kit for NCB H Primary loop stainless steel manifold designed to work on NCB H and NFC H models for fast, clean installations. This package includes new stainless steel manifold, isolation valves with gaskets, threaded connection adapter with clip and LWCO plug. Features Compatible with all NCB H and NFC H Series boiler models Made of Stainless Steel material 1" FNPT dielectric unions for boiler SUPPLY and RETURN. 1 1