B21 Series Redundant Combination Gas Valve

B21 Series redundant combination is non-regulated and the largest flow capacity gas valve manufactured by BASO.

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  • Rated inlet pressure: 0.5 psi
  • Natural Gas flow capacity at 1 inch pressure drop: 750,000 BTU/hr.
  • Available voltages: 12 VDC, 24 VDC
  • Inlet/Outlet Sizes: 3/4 inch, 1 inch NPT
  • Pressure tap sizes: 1/8 inch NPT or BSPT
  • Permissible ambient (surface) temperature: -40° to 175°F (-40° to 79°C)
Agency Listing
  • UL Recognized – B21XXA only
  • UL recognized (pending) on the regulator version – call BASO® for availability.

Download B21 Series Installation Instructions



Only licensed service professionals of the original equipment manufacturer or trained licensed contractors are approved to install or service BASO Gas Products. BASO Gas Products shall not be liable for damages resulting from misapplication or misuse of its products.

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