Originally Posted by Jammer
Hard nosed POL pigtails have to be tightened firmly with a wrench. If they still leak, they can be cleaned and given a thin coating of grease, which will usually get them to seal.
As routine maintenance, today I decided it was time once again to change the pigtails to my OPD tanks. I purchased the identically labelled items: Type 1 Acme nut pigtails marked 18CE made by Cavagna North America. The old pigtails have been attached by hand for about ten years, with zero leaks.
The new pigtails leak dramatically around the back of the green hand wheel, and I have replaced the old ones.
I am reluctant to damage the wheels by using a tool on them, as I will be returning them if they are defective.
If, however, these now require a wrench, I wonder if I can purchase soft nosed POL pigtails, as it seems a retrograde step to need a wrench.
I remove and refill bottles every week in cold weather, so this is not a "once-a-year" operation for me..