[HayZee518]

those fittings you are talking about are called compression fittings. there's an SAE straight thread in the gland and the fitting thread and a compression brass ferrule that goes over the copper line. these compression fittings for some reason are not made standard from one company to another, i.e. parker-hannefin and pfizer. the gland nuts seem to fit at first but bind up when you try to tighten them. you run the risk of cross threading them and messing up the gland and adapter.