Since you are using Vinyl tubing you don't need a PEX barb. A standard 7/16" ID tube barb will work. (Assuming that is the size tube you have)
So something like this should work. https://www.mcmaster.com/#4406t63/=17mjk1u
What I ended up doing was cutting the end off the sink sprayer hose and using a Pex 1/2" to 3/8" fitting to connect the sprayer hose to the vinyl line. Seemed to work ok. I didn't have time to test the water system today but hope to tomorrow. A bit nervous as I've never tried the water system in this van since I bought it five years ago, but it all looks intact.
What I ended up doing was cutting the end off the sink sprayer hose and using a Pex 1/2" to 3/8" fitting to connect the sprayer hose to the vinyl line. Seemed to work ok. I didn't have time to test the water system today but hope to tomorrow. A bit nervous as I've never tried the water system in this van since I bought it five years ago, but it all looks intact.
Sounds simple enough, I tend to over think things like this!