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Fisher™ Type749B Changeover Manifold Assemblies
Fisher automatic changeover regulators change from the supply cylinder (when gas is exhausted) to the reserve cylinder automatically.
Type 749B is a large capacity changeover manifold for commercial and industrial applications. It consists of two 64 Series regulators and a Type 803 direct indicator. The assembly is used primarily in conjunction with either a Type HSRL or 64SR regulator.
Fisher™ Type749B Changeover Manifold Assemblies


Body Size
1/2 NPT
Maximum Inlet Pressure
250 psig / 17,2 bar
Maximum Emergency Outlet Pressure
For Type 64 Regulators Used: 220 psig / 15,2 bar
For Type HSRL Final Stage Regulator: 3 psig / 0,21 bar
Standard Outlet Setting
Supply: 15 psig / 1,0 bar
Reserve: 5 psig / 0,34 bar
Temperature Capabilities
-20° to 160°F / -29° to 71°C


  • Large Capacity
  • UL Listed (Type 749B, Second-Stage Regulators are Listed Separately)