SBO and CO Gas Orifice
Flow Metering Devices

Screwed Brass Orifices (SBO)
1/2 - 2” NPT; rated 250 PSI
• Low cost metering device permits accurate setting of burner air and gas flow for optimum efficiency.
• +/- 1 % accuracy depending on location, measurement accuracy and proper use of correction factors.
• One piece machined brass connection
• Includes brass hex-head screws to plug holes when measurements are not being taken.
• Metal tag chained to orifice clearly shows orifice pipe size and part number.
• For temperatures up to 300 °F.
• 1/8” NPT pressure taps.


Carbon Steel Orifices (CO)
2 1/2 - 24”; rated 250 PSI
• Low cost metering device permits accurate setting of burner air and gas flow for optimum efficiency.
• Can be socket-welded to pipes or mounted between flanges (Karl Dungs does not sell mating flanges).
• +/- 1 % accuracy depending on location, measurement accuracy and proper use of correction factors.
• One piece zinc-plated, carbon steel.
• Includes brass hex-head screws to plug holes when measurements are not being taken.
• Metal tag chained to orifice clearly shows orifice pipe size and part number.
• For temperatures up to 1200 °F.
• 1/8” NPT pressure taps.