Not aware of one that would fit a Brompton. Might be a winter project to experiment with a Schwalbe AV4 inner tube and see if it’s possible to weld the rubber together.
Cheapest double ender I can find is £8. If you’re able to work out how to seal one end then you may as well buy a standard inexpensive 16” inner tube, cut it and seal both ends.
Cheapest double ender I can find is £8. If you’re able to work out how to seal one end then you may as well buy a standard inexpensive 16” inner tube, cut it and seal both ends.
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