Land Rover Defender TD5 Washer non-return valve issues again

In an earlier video I described how I cleaned the washer reservoir tank as I thought it was causing issues and blocking the non-return valves preventing full flow when I washed the windscreen. In part I was right but since doing this I have had 3 non-return valves fail. It seems to be the rubber in the valves is swelling leading to a blockage of the water. This video describes the issue and the fix, albeit perhaps temporary ! Time will tell....

"Paddocks" is where I buy most of my Land Rover spares.

Here is a link to the valves and their main site: https://www.paddockspares.com

Valves: https://www.paddockspares.com/amr6676-valve-non-return.html ... https://www.youtube.com/watch?v=Z31nVkKrPIE