Some of these stainless steel pipe nipples have short threads. This means they don't have enough thread length to actually engage cone fittings that are manufactured to be NPT rated. I have several 3/4" and 1/2" stainless steel pipe nipples that cannot be fully tightened with stainless steel elbows, couplers, etc. That means I need to find a plumber who can thread in the right size nipples.
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