As above, mine are disabled because the valves in the mounts have gone and once used they syphon 5 litres of washer bottle out onto the floor.
The mounts with the valves in are above 1/4 the price of the car so not going to buy those....................
.......................however, I hate things that do not work.
I was looking for a non return valve because they have a little spring to close them but not found anything with enough spring.
Then I was looking for an in line pressure release valve - again nothing
Anyway awaiting my £2.90 12V solenoid operated normally closed valve from China off a well known action site.
Of course the easiest idea was loop the pipe up above washer level and drill a 1mm hole in it.