Tapered Pipe Threads and Fittings: Making the Connection

NPT, National Pipe Taper (American) and BSPT (British standard Pipe Taper) are tapered pipe thread standards. Male and female tapered pipe threads wedge themselves together but need a sealant for a completely leak-free connection.

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Taper Seal Connections

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Tapered Pipe Threads and Fittings: Making the Connection

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The tapered pipe thread

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American Standard External Taper Pipe Threads