I appreciate this thread is 3 years old but people will still find it on a Google search. Just to add that the maximum fall is recommended as too vertical a fall over a distance can cause water to completely fill the pipe creating a vacuum that will then suck out the water from your u bend.
What is the best way to seal 3/4" BSP parallel to parallel threads.
The shower valve I have states use parallel fittings only.
I need to seal the incoming water fittings (15mm to 3/4" BSP parallel) and a blanking plug at the bottom.
I can only assume that the female threads in the...