The original couplers leaked, whether connected or not. But mostly when connected. I am aware that they drip when first disconnected, but even after washing all the residue off, they leaked/sweat and dirt would collect. The parts guy at the dealer said he's heard of quite a few NH couplers leak.
I did try new O rings prior to replacing them, and resealed all the threads on both sides...same results. So the parts guy advised another brand and I replaced them. Maybe the original ones were from a bad batch?? Either way, I think I'll reinstall the originals and keep the newer ones before I trade it in. If the ones on the new FEL give me a problem, I can replace them with the better ones.
BTW...I used the plugs and caps when disconnected from day one, and always kept the couplers clean. So I doubt dirt was the cause of failure. Appears to me that it is a quality control issue. /forums/images/graemlins/confused.gif
Based on what my parts guy said, I'm surprised that the other NH owners here at TBN have not complained about them. /forums/images/graemlins/shocked.gif