Home / Aztec / DOUBLE BLOCK VALVE, FLANGE X FLANGE (MODEL NO. DB-FBNF) DOUBLE BLOCK VALVE, FLANGE X FLANGE (MODEL NO. DB-FBNF) Category: Aztec Related products DIRECTLY MOUNTED FIVE VALVE MANIFOLD 5VMT SEPERATELY MOUNTED THREE VALVE MANIFOLD 3VMS HIGH PRESSURE INSTRUMENT BALL VALVE IBV SERIES DOUBLE BLOCK AND BLEED VALVE, FLANGE X THREAD (MODEL NO. DBB-FBNBT)