I’m working on plumber and right now I’m working toward getting my AC and heater hoses plumbed behind the dash. I have read that when I crimp them they will shrink or stretch I can’t remember. I don’t want to have issues with them being too short or long... I can see a little hole in the crimp fitting so I can tell it’s touching but I cut mine to the exact length, I can always recut them. I have not crimped them. My question is 3 part.

image.jpg

1. does this look okay or should I cut my hoses longer in anticipation of shrinkage or shorter in anticipation of them stretching a little.

2. I bought the master cool AC hose crimped from Amazon. Has several different sizes. 8,10.... what size are the fittings here?

3. I have seen on TV that one should oil the O rings. What type of oil are they using?

Thanks