Originally Posted by ependydad
So, I got the ball valves and put them into place this even. Fortunately, "Brian" at Lowes saw that I was lost in the plumbing area and was amazingly helpful. Took me right to what I needed.
Unfortunately, they both leak just a bit. The cold is worse than the warm. I don't know if I did a crappy job taping the threads or what (it was harder to get a clean/flat layer of tape than I expected). I'll try again when it's daylight or possibly try the paste. I don't know.
Oh- the original threaded end pieces had these inserts. Any idea what they are? I had to remove them to get the ball valves installed.
Looks like ferrules or gasket installs between the outer nut and the tubing. Used in copper, plastic, stainless tubing, very common. Not the same thread as pipe fittings. I'd take all the above including the caps to Brian and explin the situ. You can also convert the Pex blue/ red tubing to pipe fittings, maybe better, he can show you how.