406oc.co.uk

I managed to pick a breather up from Partmart for a fiver But the engine won't start while it's connected can anyone shed any light on this please?
Thanks Mike

How important is this part do I need to rush out and find a new breather or will it be alright for a while?
Thanks Mike

Thanks for your reply I'll give it a good clean later ;) and now I know the name of it I can search for a new one if it broke

Hi all can anyone please tell me what this is and is it supposed to be open like this?(Pug 406 2.0 petrol)
Thanks Mike