Answer Posted / ramesh sobhani

There is no difference in constructional dimensions and the
acceptable diameters in both the case. the difference is
only for fixing to the equipment. If the equipment is
having Npt thread then we have to use NPT glands and if the
equipment having blank holes then have to use M20X1.5
glands with check Nuts. whereas npt glands are conical
thread and are fixed directly on equipment No check nut is
required BRACO

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