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I recently bought a 1900 home with steam. A pipe servicing a second floor rad had been cut in the basement, and sure enough when I tested the section going up the wall it had a leak. I ended up cutting it out and now need to replace it. I noticed that the old verticle pipe is threaded at a slight angle on the ends, so that the pipes coming off of it have the correct slope. Is this the way it's still done to get proper slope? Can pipe be threaded at an angle with a regular pipe threader? If not who can I get to do this for me?