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I use Loctite 55 thread for sealing half-inch and similar BSP male screw-threads. But when fitting a monobloc tap with the tiny 10mm threaded tails where the Loctite thread looks too fat, should I rely on the O-ring (with a dab of silicon lube) for sealing, one turn of PTFE, a smear of Loctite 577 or what please?