I just purchased your Fuelab 57504-2 regulator for my application. It uses 6AN fittings, but you do not offer the tread size of the regulator ports. Since you do not supply the fittings with the regulator, I need to know what to buy. Are they inch size, metric size, what? You should be more specific when you list your product specifications as these fittings come in all kinds of thread sizes.
It’s a -6AN thread (standard thread in the performance world) and the o-rings are supplied in the hardware kit. As mentioned in the instructions, the regulators will accept a straight cut or 37* flair.