Quote:
Originally Posted by aklim
Not true. 3/8 = 0.375 inches = 9.525MM. so, A little grease and a lot of shoving and viola. Hose fits in.  Only 2.475 MM difference. What is that between friends. 
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When it's a return hose in a hydraulic system, the difference can be huge. A 3/8" hose has a cross dection area of approx. 71 sq. mm. A 12mm hose has a cross section area of approx. 113 sq. mm. That means that the correct hose is 59% larger than the 3/8" hose.
Your point that numbers can be challenging is well made. Very well made, in fact. And you are to be commended for being such an easily satisfied customer. I know that the store clerks appreciate the fact that you are willing to accept whatever part causes them the least amount of inconvenience. Whether it fits or not.