I had black water flush installed from Jayco, not sure type of flush they use. It leaked during first outing, took it back for repair, it started leaking again second time out, decided to look at it myself, it was a simple fix, don't know why dealer or factory used so thin of a thread sealer. It felt like glue-it was that thin, anyway it's fixed now. Sometimes it's just better to do it yourself and you know what you get. No crimp connection that I know of, you just need to use a good pipe thread sealer.
2010 F250 6.4 L
2011 Jayco 330 RTLS