I might be mistaken but I was told that the maze blocks(2.1 and 2.2) use 1/4"NPT fittings.
Now on a 1/4"NPT fitting the inner diameter is 1/4", Of course some manufacturers go larger, but only up to about 5/16" or so.
So if your running 1/2" tubing but still using a 1/4"NPT port, your not getting as much of a gain as you might think.
Best thing is to move to 3/8"NPT or even 1/2"NPT. Although 1/2"NPT is a BITCH to put in a block.
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