AND, you MUST engage the second thread IMMEDIATELY, because any additional turns will screw up your calculation as to how many turns before they are equally hand tight. As I said, it is not something for an amateur to do, assuming he could even locate a left right coupling/nipple combination. Also, the left hand nipple is ALWAYS 4" long to complicate the situation.
I agree, although I am confident I could get it installed. Perhaps, it might take a couple of attempts, but if it tests OK, then it is OK. I found a source online for the parts, which is where the FAQ came from, but I could not seem to include the link in my post. It kept blanking it out, so I must have some setting wrong somewhere.
I am going to start a new thread regarding a possible alternative solution to this project.