I just picked up a Little Giant 2-MDQ-SC, and it has 1/2 fittings, in and out. I picked up CPVC fittings at Lowes, and a good 1/2 barb with 11.5mm ID at Home Depot. Lowes sells cheap 1/2 barbs that are seriously undersized.
myv65 has an article on this tubing issue, and he recommends using one size larger than the blocks inner channel size equivalent, or something like that...
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