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I just replaced mine. Used the Parker 601-8 hose as recommended. My old lines were weak and collapsed just like the DIY. My truck was also throwing the P0087 code when towing uphill. Haven't towed again yet but I'm sure the collapsed hoses were the problem.
 

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Did it fix the P0087 code? I am throwing them left and right when I tow my 5th wheel. Seems to be happening going uphill between 1800-2000 rpm. I can make it up a little then I see blow smoke out the tail pipe and then it throws the code....frustrating.
Mine ended up being the CP3. Replaced the CP3 and the code went away. It's a big job.
 
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