I'm in the process of changing my prop valve from 3040 to 4040 and I've got all the lines loosened except for one. I dont want to have to run a new line. Is there any other tricks guys use to loosen the fitting off the prop valve. I've been lubing it for about 5 days now, i used a line wrench, and i even heated the prob valve. Anything else? Or am I pretty much screwed?

 

have you used pb blaster it works great for me.
im not to sure about heating it but if you going to heat it.maik sure you dont heat the fitting heat what it goes in.