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These exist for campers, including a non-return valve for air:
https://www.ebay.co.uk/i/111988988013But they're designed for widemouthed jerry cans that take a submersible pump.
(and thus also have a grommet to pass the power cable through)
Something very similar/identical to this but for a 60x6 cap would be spot on, shame this one is a little too large.
Dammit
Nahguavkire
These exist for campers, including a non-return valve for air:
https://www.ebay.co.uk/i/111988988013
But they're designed for widemouthed jerry cans that take a submersible pump.
(and thus also have a grommet to pass the power cable through)