Keep it simple and use the barbed fittings with the 3/8" or the 5/16" jumper going through the CPC-100 in the wall of the jockey box to the coupler and 3/16" ID line between the 1/4" barb and shank nipple.
You could just cut the hole in the wall and use this for routing the jumper versus the CPC-100. Your choice. Neater with the sleeve.
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