ROFL Tim, if you look at the drilling it's obvious what it's venting but you would only look if you have had the problem. I can't remember the number of times I had apprentices snap off nipples trying to force a gun off back in the day....this was an eara when we still had A60's coming in to the workshop mind you ;-).
Nothing wrong in changing connector ends but to be honest mine is 50 years old and I suspect had more use than most being used every day on the shop floor for the first 10 years and it's never had a new end and locks on fine and is still tight, mind you it is a Wanner and they build quality stuff. Some nipples are rubbish and very poor quality so they certainly need changing, never did in the past but they never came from China either!
