The GCS hoses are designed to ensure gas flow in only one direction, ie towards the male fitting.
I am not sure what you hope to achieve by this, but of course it would be Darwinesque to have both loops connected IMHO, one loop flood and you will go down in history...as well as the water column...
Personally I am just waiting for the side mounted Ouroboros to appear next year then I'm off.........
Cheers,
Dave.