NPSH 3
NPSH 3 : National Pipe Straight Hose thread, also known as IPT (Iron Pipe Thread, or International Pipe Thread). Like NH threads, NPSH threads are commonly used in fire hose couplings, but the two types are not interchangeable with each other and cannot be connected together without adapters. NPSH threads have a slightly smaller diameter and more threads per inch than NH, but NPSH hoses can be fitted to NPT (National Pipe Tapered) plumbing fixtures, as the diameters and thread pitches are similar
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