I'd like to experiment with using a 2L coke bottle as a pressure vessel but
I haven't worked out how best to make a leakproof plumbed connection to the
bottle.

Does anyone know of an adaptor that would let me connect some flexible pipe
(10mm ID say) to the neck of the bottle?

The thread seems to be common for lots of bottles now but I haven't found a
suitable adaptor yet.

Tim