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coupling/fitting is welded in an ASME tank. An adapter may be acceptable if it has 1/2 or 3/4 NPT male with a 1/2 BSPT female coupling fittings, npt adapter to bspt, spud NPT male w/BSPT female spud or adapter, 1/2 BSPT threaded forged steel pipe coupling that meets either SA105 or SA181