Just a bit of advice, when installing PTFE thread tape:
Make sure to run the tape tightly across the threads, below the top thread and in the same direction as the threads are being screwed in. If you don't do this there is a good chance that a chunk of thread tape will end up plugging your unit or even ruining the solenoid.
I used to be an airsmith for paintball guns and have had to replace too many solenoids due to sloppy thread tape work.