Defect with a hairline crack. I assembled the pipe and valves by hand, increased the pressure in the line and saw a stable drop. The dripping got worse as I tightened, at which point I noticed there was a crack at the pipe nipple. This is of lower quality and as others have pointed out the threads are not NPT compliant. My valve was seated against the nipple thread with minimal torque. Properly milled pipe threads taper and tighten with each turn. Multiple threads should remain visible if threads are cut to standards and fittings are not overtightened. Avoid using this brand. Saving $2 or $2 isn't worth the hassle of removing and fixing.
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