very pleased with this item.
Reviewed 7 years ago
by Dave Bush
Received the non return valve by return of post from Shower Doctor. The valve did the trick and got my pump working again. The fault had been pulsing on-off of the pump.
I had not found any instructions or clear diagrams of my pump on the web showing exactly how to fit the valve, so I put it in the only place it seemed to fit which was between the hot water output of the pump and the flexible pipe. It simply screws into place.
I expected to have to dismantle the pump but it appears all you do is put it in series with the existing internal faulty non return valve.