A 5/8" 90 degree heater hose would work but would get soft from the oil fumes.
I bought the OEM hose from Chrysler for $8.00. That's what I'd recommend.
Thanks, glad I asked! I had read the use of heater hose from other threads. Would be a shame to have a good valve, but having the hose soften in time and collapse on itself, thinking all is good, is a nasty trick.
I couldn't find a part number for that little hose, don't need the whole assembly with pre-heater. Looked at local O'Reilly store, and sure enough, Gates makes PVC hose, Nitrile spiral reinforced construction to resist the fumes and collapse $3.50 a foot. Buy a foot, cut to size.
Although, looking at other posts, I found this:
"The heat exchanger is 1/2". The PCV valve is 5/8" and does not at all fit in the 1/2" hose".
This is what another guy did:
"I went to advance and they sized up the hose and using two feet of universal emission hose that is oil resistant. I also bought a brass 5/8 to 3/8 adapter from home depot".
This is getting way too much, looks like it might be a lot simpler and smarter to just to go factory on this?
I did find CHRYSLER OEM 04792645AC - around $115 online, $75.00 on e-bay. I couldn't find the factory small hose, just the entire unit.