I'm after a non return valve breather for my petrol tank - it's 8mm pipe which is going to connect the breather to the tank.

It's the gizmo which has a ball bearing in it so that if I manage to flip the car over I won't be covered in petrol.

Beer tokens waiting.

This is the one I have use3d just insert it inside a piece of rubber pipe with breather filter on the end does the job nicely

link

I used a canister vent valve off a Corsa. It stays shut until it sees 12v so I have it wired to the fuel pump, which stops as soon as the engine does, or if the inertia switch is triggered. The Corsa valve was £5 from a scrappys.