"I needed something like this to connect up bath, shower and basin wastes below a wc connection but where there was limited space. I tried one from tool station that had a rib all around where the top and bottom halves of the chamber met that fouled on the adjacent joist. This looked like a better prospect as the chamber is flush with the line of the outside of the pipe. One thing that was not obvious from the picture is that the angle between the two straight faces is significantly more than 90 degrees to accomodate the four inlets. I had to chop some material from the adjacent joist to make room. If it's bracketed off a wall then there should be adequate space for it.. As I said above it's a great solution and at a reasonable price. I cannot really comment on the performance or reliability yet but I have no reason to doubt that it will perform well."