Thanks and when running pressure won't be mains pressure as the shower is flowing. Cause a restriction and it becomes full mains pressure and the diaphragm splits. Seems you can just get the diaphragm
Thanks, so the pressure to the priority is 3 bar. This is then knocked down by the temperature control knob to 1bar? So only thing that can cause a surge in pressure is a kinked shower hose/head?
Thanks there is a knuckle elbow just down the line I can see but can't get to. I may have to just go with the plunger. And the wet dry vac on the 40mm pipework. Is a kitchen sink so imagine it's the outside walls of the sink that is gunked up.