[bestgenman]

I think what you are describing is what I call a flapper.  When the steel insert of the end fitting is threaded into the rubber (with overall steel braid) , it cuts the rubber and makes a really nice check valve which always works when you don't want it to work.  I can't count the times I've made up a hose with a flapper and about the only fix is to cut the end of the hose off and start again.  My experience is mostly with fuel lines but air suffers from the same malady.