ICOT: Some of the old pipe here is from the Brit influence when they still used inches, and most of the cast iron is inch sized. Then there is asbestos pipe and concrete pipe, and clay pipe in whatever size the unsteady supply supplied. The modern media are plastic sized in 110mm, 50mm 40mm and 32mm closely matching 4″ 2″ 1.5″ and 1.25″ The wall thickness, and the way they do gas pipe here would land you in jail if you did that in NY area. In threaded pipe there is a mix of NPT, the American way (9 degree taper) and BSPT, the British strait thread. This gives one way too tight, and one way too loose. We also have stuff influenced by the European tzarut ayin mistaken for economy. Life for and American plumber here is challenging, but fulfilling. You can also walk into any hardware store and buy really caustic stuff with nary a safety label.
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