That's a 1/2 inch o.d. 3/8 i.d., I can not tell any difference when filling the tank.The sock is the first filer, then a before pump and after pump filters total of three, that's on -6 lines.but it could step up to -8, I have run this set up on my car for (and I can't remember exactly) for about 18 years.( I know I was still married to my first nightmare)
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