Barb is 3/8". Base thread size is 1/4" Male NPT threads. Fits common plumbing, gas, and air fittings.
Brass Gas Parts - kkinternational
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Bunsen Burner Propane Adjustable Control Valve Gas Regulator Lab Low Pressure
Brass 3/8 Barb X 1/4 NPT Male End Air Hose Pipe
in Pipe Fittings.
uxcell Brass Hose Barb Fitting Straight 3/8 Inch x NPT 1/4 Male Thread Pipe Connector for Water Air Fuel Tube 2pcs
Barbed Brass Fittings at
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Everbilt 1/2 in. Flare x 1/2 in. MIP Brass Adapter Fitting 801429
Hose Barb Fittings for sale
Airgas - RAD64003956 - RADNOR™ CGA-320 X CGA-580 Brass Carbon
Welding Gas Hose Adaptor - Thin Gas Hose to Full Size Regulator