[Belairbob]

Thanks for answering LockDoc!

I have a new one that is also suppose to be for the 69-70 but it looks
the same. I tried blowing into the check valve hole and sucking air back -
I can push air through this way as well as pull air back.
I'm thinking the rubber gasket must be sealing the lid to the neck
and cutting off the air flow, or something like that.

Bob