My pigtail went bad a while back (one of the fittings began leaking). Dealer replaced it under warranty, but the one they had in their shop had the wrong size threaded end into the regulator as well, so the tech just grabbed an adapter out of his bin and threaded it on for me with the appropriate tape (yellow tape), and included some extra tape so I could put it on the regulator myself. Installed it when I got home, and all was well.
I wasn't going to drive my trailer to the dealership for a simple repair like that, so I just went and got the part one day when I was in the area and installed it myself. Dealer was happy to accommodate because it saved him and me both time and money.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!