It has what appears to be a 5/8" screw adaptor. The user manual clearly states it should not be used with a regulator, it should be connected directly to the gas cylinder.
Thanks for the tip, I'll try that. Just out of curiosity, what could be the reason the manufacturer states that it should not be used with a regulator? I don't know much about gas regulators (other than they control the pressure). In my mind it shouldn't make a difference whether the device is hooked up to a regulator or directly to the gas cylinder.