My UDS taps have brass line fittings with a little brass cuff that goes on the line and a screw in brass connector.
It's impossible to get the brass cuff onto the beerline. Is there a trick to it that I just don't know?
Are these the ones from Killarney?
pics?
Ya I think I've got the same on my keg couplers. The brass cuff is actually an olive for the compression fitting. I bought a bag of 10 of them on ebay.co.uk for cheap. Search for 3/8" stepped olive and see if that matches the cuff on your tube. The new ones slip over the tube easy enough and only grab the tube when compressed.