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Pipe sizes (comparison table of imperial and metric units): Inch is a unit of length. 1 inch = 2.539999918 centimeters. The inch is a unit of length used in the United Kingdom (UK), that is, Britain (the Commonwealth), and its former colonies. The United States and others **also use it. In Taiwan and **, “inch” is usually written as “ inch”. The common abbreviation for inch is \"in\". The character \" inch \" is a term created in modern times; it is pronounced as \"inch\". It belongs to those Chinese characters that have two pronunciations. Other examples include \" nautical mile \", which is pronounced as \"nautical mile\" – these terms are derived from traditional Chinese length units like \"cin\", with an additional radical added to distinguish them. It was also used on the mainland, but was abolished in 1977 through the \"Notice on Standardizing the Spelling of Some Unit Names.\" I. Dimensions: DN15 (4-inch pipe), DN20 (6-inch pipe), DN25 (1-inch pipe), DN32 (1.5-inch pipe), DN40 (1.5-inch half pipe), DN50 (2-inch pipe), DN65 (2.5-inch pipe), DN80 (3-inch pipe), DN100 (4-inch pipe), DN125 (5-inch pipe), DN150 (6-inch pipe), DN200 (8-inch pipe), DN250 (10-inch pipe), etc. II. Divide 1 inch into 8 equal parts ； 1/8 1/4 3/8 1/2 5/8 3/4 7/8 inches. This is equivalent to what is commonly referred to as 1/8 inch to 7/8 inch; smaller sizes are expressed using 1/16, 1/32, and 1/64, with inches still being the unit of measurement. If the denominator and numerator can be simplified (such as when the numerator is 2, 4, 8, 16, 32), they should be simplified. The inch designation is indicated by two dashes in the upper right corner; for example, 1/2". A pipe with a diameter of DN25 (25 mm, the same applies here) corresponds to an inch-sized pipe in imperial units, and it is also equivalent to an 8-inch pipe from before the liberation. A DN15 pipe is equivalent to a 1/2\" pipe in imperial units, as well as a 4-mm pipe from the period before the liberation. For example, a DN20 pipe is equivalent to a 3/4\" pipe in imperial units, as well as a 6-mm pipe from the period before the liberation.