September 1, 20215 yr We are about to start work to bring water into our plot. While we are there, we are going to replace the existing lead main for the original Bungalow before we sell it. Here is our approximate run for these pipes. The existing bungalow is to have a 25mm main, the new one a 32mm main. What size ducting will I need? I had thought 63mm would do it, but my groundworks contractor is suggesting 100mm due to the length of the run. I know ducting isn't essential by the way.
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