Look at the picture of alphacools poorly made block with the fitting screwed in. By having no threads on 1/2, it does not help flow at all. I used a bitspower fitting which already pushes the envelope with very short threads, and any amount of threads is going to block some of that "hole", so no increased flow will exist.
So looking at that pic, why is there not at least some threads on 100% to at least equal the amount that even short threaded fitting sticks out? NO possible reason other than cost. Or was I supposed to cut 1/2 threads off my fitting as well, and then match up the holes?
Looking at the design to make threads 100% might cost a little extra. But unless water magically flows through metal fitting screwed in there, it wont help flow to have no threads there at all.
As for how much torque, mine was not finger tight and easily stripped.
alphacool_bpfitting.jpg



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