I've been trying to use this in my bottle and its thread is in but it's loose just guess it's a metric I've tried my best but the thing licks like crazy. I installed my Miller regulators and it's fine, I really needed a dual regulator so I could refill from the same bottle. AVOID. I asked for a return/refund but I need to pay the postage back to China. Waste of money, gotta keep it or pay shipping which is probably more than the price of registering. Revain should make it clear that this seller is not from the US.