What are the commonly used water supply pipe sizes?

Generally, there are four water supply pipes, six water supply pipes, 1 inch water pipe, 1 inch 2 water pipe, 1 inch half water pipe, 2-inch water pipe, 2-inch half water pipe, 3-inch water pipe, 4-inch water pipe, 5-inch water pipe, 6-inch water pipe, 8-inch water pipe,1inch water pipe and so on. Its specifications include 15mm for 4 pipes, 200mm for 6 pipes, 25mm for 1 inch water pipes, 32mm for 1 inch 2 pipes, 40mm for 1 inch half pipes, 50mm for 2-inch water pipes, 65mm for 2-inch half pipes and 80mm for 3-inch water pipes. There are four kinds of commonly used water pipes: 15mm4 water pipe, 20mm6 water pipe, 25mm 1 inch water pipe, 32mm 1 inch 2 water pipe, etc. These are common specifications.