First, they are not NPT compliant. (National pipe thread, US standard). There is no taper, the diameter is the same throughout the length of the thread, which is why the fitting flows. Brass fittings are designed to deform and therefore create a tighter connection, which is absolutely essential if you don't want your home or business to explode when using it for flammable gases such as LPG or natural gas. does not cut well, I first noticed burrs (metal shavings) which I unfortunately removed before taking the picture, but burrs on fittings are generally not good. It looks like the manufacturing process uses worn dies that need to be replaced. Any decent quality control should catch these imperfections before they leave the factory. I have been very busy and only now have the opportunity to use fittings that I have ordered for too long to be able to return them otherwise I would so they go in the trash.
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