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Thanks Peebee and - that's a good suggestion. I shall consider.

I think in the mean time I will be putting one of these on the elbow vent (Bermad Vacuum Release Valve 15mm). It is cheap (and the...

Thanks Cremulator,
it's not a ball valve I need - they are manual. I'm after an automatic system. One that will let air in to prevent vacuum and let air out but not water.

Thanks fastflag, looks good.

I have a PVC (100mm diameter) water tank mounted to the underside of my roof tray (Patrol GU IV) - it holds ~50L. It's similar to the one pictured above, but in a...