Undersink filter connection broke

[gator67]

I hope this isn't too confusing.

This is in regard to the filter connection under the kitchen sink that goes to the small spigot.

The input line goes into a plastic fitting that has a 1/2" male connection at the input end and a 3/8" inch male connection on the output end. The 3/8" male connector on the output end goes into a brass fitting that has a 3/8" female connection on the input end, and a quick connect on the output end that the undersink filter snaps into.

The 3/8" male connector cracked where it went into the brass connector. When I tried to disconnect things, the 3/8" plastic male fitting broke off, and was flush with the end of the brass connector. I tried to extract the plastic piece by unscrewing it but was unsuccessful, so I've been trying to pry it out, but I'm afraid of stripping the brass fitting.

I have been unsuccessful in trying to find the seemingly unique brass fitting with the quick connect on one end and a 3/8" female connection on the other end, nor have I even been able to find a plastic connector with a 3/8" male connection on one end and a 1/2" male connector on the other end.

I'm looking for options. I would like to restore the setup to it's original state. I can rig it up so the input side of the filter screws into the water line (not using a quick connect), while leaving the quick connect on the output side of the filter.

I currently have the line plugged.

Does anyone know where I might get replacements for the original parts? Any other suggestions?

[trackman]

Here is a link to a place for Alpine and other RV water systems and parts. I have not used them but they seem to be knowledgeable www.rvwaterfilterstore.com/ABChoosingASystem.htm