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Roll Over Valve Fuel tank roll over valves that allow air in to replace fuel used, air out due to heat expansion & a positive shut off to prevent fuel escape in the event of a roll over. This is achieved by a two ball system, one hollow plas
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This allows the tank to breathe but won't let fuel out if it goes upside down
I'll have a chat with him again it's for a supercharger in a good pickup think it was a coolant tank, vented is only a rough description now that I think about it, there's lots of ways it can be vented, asked him to send me more details