Tried putting ball back in and have bought 2 new PRD’s, the last one after a new shower head and hose. Obviously cheaper than a new shower though £8 every few weeks soon adds up!
The existing shower is 7.5KW the new ones are available in 8.5 to 10.5KW so will have to go with 8.5
Not sure what the cable is rated for….its a big thick grey one like what is used for internal wiring to plug sockets etc