Can some point me in the right direction where the rear washer one way valve is please on a type r ? TIA

 

It would appear that the joiner shown as 86638D on diag below has been replaced by 86638KG030 (below)

 

Cheers it's next to the rear wiper motor

 

I know this is an old post but that isn't just a joiner. It works like a pressure relief valve and is directional, note the arrow. It's job is to only let water through when the pressure exceeds a certain level. I mistakenly replaced the one on my Y2000 5 door with a normal joiner. After that the rear screen got washed every time I accelerated hard as the water was thrown backwards in the pipe.

 

post is only 6 days old,bought a new one and it's sorted now