Registered Forum User
Ducati Meccanica
Posts: 2,263
Join Date: Aug 2003
Location: Wimbourne, Dorset
Mood: I'm so happyyyyyyyyyyyy
If you're worried about it leaking, use a RC boat/plane fuel tank with a brass "clunk" pick up. I've used these before and had no leakage problems. They have a breather tube/vent that you can take off an secure elsewhere.
You should only have an inch or so of expansion on the hottest of days, assuming your cooling system is in good shape.
rgds,
Rob