Originally Posted by Barganman04
Just picked up a Cornelius Primay and 4 Secondaries as well as a Norgren Dual Reg Primary and 4 secondaries.
I don't know how to tell what type of threading they have to buy the correct replacement gauges & couplers. I went to the company websites with no luck.
What to do?
If you look very closely at the last thread on the fitting you can tell. Looking at the female fitting on the regulator body, look at what direction the last thread is going. Counter-clockwise is standard thread, clockwise is LH.
Or, you can take a plain old pipe fitting (Of the right size of course) and see if it'll thread. If it does, it's RH - Otherwise it's LH (Also assuming that the threads aren't buggered.)