I have just bought a couple of water filters from Screwfix but I'm not sure about what fittings to use to connect pipes to them, as they have 3/4" NPT threads. Most plumbing parts available in Hungary are actually imperial sizes rather than metric but I think the threads are all BSP, the British system. I think washing machine hoses are 3/4" BSP on European machines. I just wondered if American machines are the same or do they use 3/4" NPT? If they do there might be some kind of adapter I could buy. Someone told me I could use 3/4" bath tap connectors but that is still a bodge as they would also be BSP.