NPT fitting doesn't quite fit in NPT tap!

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Jadnashua

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BSPT (British Standard Pipe Tapered) is similar to NPT, but the specs are slightly different. Metric thread type is most common in Europe. It has a cylindrical inner and outer diameter precise in millimeters. The fine taper of metric tapered thread allows for the best possible force transmission. In writing, you can identify metric threads by a capital “M” plus an indication of their nominal outside diameter (ex. M22 x 1.5). Lastly, when measuring pitch size make sure you’re using a metric pitch gauge.

NPT thread type is most commonly used in North America. You’ll recognize it by its tapered outer and inner diameter which is self-sealing. When torqued the flanks of the threads compress against each other forming a leak-tight seal. However, it is still recommended to use PTFE tape or another sealant compound to guarantee a completely leak-tight seal.

A semi-compatible variant of NPT is NPTF (National Pipe Taper Fuel). It ensures an even more leak-free seal.
 

Jeff H Young

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well I'm not reading through his posts again if the chrome don't fit but a gal or brass nipple does its bad parts he got ! Good luck diyorbust
 
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