Most were watts brand fittings from Menards. I had normally used all crimp fittings for plumbing work. Really don't know why I felt the need to deviate. Anyway, shop is now crimped, and house is all sharkbite. Probite looks to be the same as sharkbite to me also. Upon further inspection of the watts fittings, I did notice what I assume is etching of the plastic reinforcing inserts for the PEX lines. All along the only conclusion I could come up with as a cause for the leaks, was the possibility that the watts fittings were not compatible with the chemicals in the system. I dunno for sure, but that's the way it appears anyway. Jackel, It was a long time for me to be convinced as to the merits of using pex in plumbing work until I did my first job with it. Haven't looked back since. I still solder my share, but usually for repair, or when I need a hard connection.