ThisCO₂ to Argon Regulator Adaptor is a simple and effectivebrass fitting designed to allow the use of a standardargon regulator with aCO₂ gas cylinder. The adaptor features aright-hand female thread to fit CO₂ cylinder outlets and converts it to a5/8" BSP female thread, compatible with the bullnose fitting on most industry-standard argon regulators.
eBay