Hello Forum, I am planning on fitting a water softener under my sink. I'm advised that it should be connected to 22mm pipes as I have a combination boiler. Currently the water main is connected to a 15mm pipe, then to a 15mm stopcock, then off to the house and appliances. The incoming water main pipe is plastic and 27mm in diameter. I've attached a picture of the current setup which I want to change to 22mm copper pipe. Thanks, BB
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