The point is adapters are not the way to go with this block. Just go buy you a couple 1/4 NPT to 1/2 barb fittings. Use teflon tape on the threads and screw the fittings into the block. They will thread in and with the teflon tape will seal. all you need to do is snug the fittings tight if you over tighten them bad things can happen. I think I got a total of 4 threads in mine. Easy way to do it is hold Block in one hand and wrench in other. when you cant hold the block from turning in your hand that should be tight enough.
Aardil
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