90 degree fitting at water heater

Need to repair a leaky 90 degree fittting at the water inlet on my Atwood.
"Pex plastic fitting"

Have you tried one of the big box hardware stores or an Ace Hardware? They usually have a good assortment of fittings.

Our broke last Sept. and our unit was just shy of a year old. Heartland authorized mobile repair guy to come out and repair it.
If it is under a year old you may want to give Heartland a call and see if they will authorize it.