Backfill as filler tubes are raised

[kloon]

When the filler tubes are raised the volume they displaced while being inserted will need to be topped up.

An idea would be to reopen the filler tubes after x amount of retraction for a short period. We might be in luck here to get away with not doing anything is the beer left in the tube is sufficient to top of the can/bottle as it retracts.

[KINGGarry]

I agree. Our tubes occupy 14ml in each can.

[lalo-uy]

And a little co2 after that will provide foam over the beer, to avoid air below the cap.

[interstaller555]

I run a “real” 3 head canner - microcanner flex - and the burp of CO2 pre-lid placement takes care of that - that’s pretty much industry standard.