We are getting grounds work done and getting the mains water from the outside of the house renewed from the old led. He seems to be fitting qualplex plastic. (light brown or cream colour.) I would have taught they would have used heavy gauge plastic. (black)
He told me that it was only to save him a fitting inside the house at the toilet. I asked him to put in the heavy gauge into the house and use the extra fitting. For the sake of 1-2 euro.