It might be restrictive if not oversized, if the rubber was'nt firm enough it'd leak, too firm and its not going to open up. I was thinking of a kindof 'catflap' that only opened one way, with just enough tensity to keep it in the closed position, you'd still have the full size of the bore with a flap. I'd try to incorporate it into an airtrap~fillpoint or small fitting, as I'm not keen on reservoirs...
It's a good idea though, never seen 'owt like it before...
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