modern car problem....high engine case vacuum

Vauxhalls have had a thing in the rocker cover for ages 20-30 years, you used to be able to remove them from the cover and clean them, maybe its possible on your old thing, could also just be a blocked pipe

 

checked all the pipes today and they are clear

dont think I can remove the valve from the cover so I'm hoping I can clean it/free it up ....of I'll have to buy a whole cover

 

How do they get it in there

 

its a modern car ....they employ witches to use magic ......or its possibly some star trek type teleport thing

.....unless you can buy them separatly, then they might have just screwed it in

 

I bet it's just push-fit ...