I've done a few of these over the years especially on a long bungalows or very large properties, They've been a design for decades. I learned about them in the 1980's, Interestingly enough though, a lot of new plumbers have never heard of them
That’s a great explanation on how to run them in. I struggled big time when I tried to install one for the first time, many years ago. I dreaded commissioning it as I was sure I cocked up something 😂. (It was fine 👌🏻)
