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Question:

How about the water pipe fittings and millimeters?20mm is 425mm is 6Why

How about the water pipe fittings and millimeters?20mm is 425mm is 6Why

Answer:

Because, in the past, the workers who used these units were ordinary workers, so that they were easy to operate, and finally became 4 points, 6 points, and so on. In other words, it was also the wisdom of labour
This is the confusion caused by the confusion of the three conceptsA,4 points, is commonly known as, should be 1/2 inches,.4/8 is 4 copies6 points, 3/4 inches,.6/8 is 6 copies
20mm is not a scientific argument.Should be the plastic pipe, the nominal outer diameter of DN20 plastic pipe, only corresponds to 4 points of the metal pipe threadThree,If it is a metal tube, it should be nominal diameter Dn15, and the corresponding English pipe thread is 6

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