"Brilliantly simple solution to a common problem when you're fitting a new component to an existing pipework and there's no "wiggle" room. Connector without a depth stop. Slide the whole thing over one pipe, force the new pipe into place, slide it back over the join and solder."
"These worked well, and did exactly what you would expect, I am not sure if it is just my local branches, but the stock level on these seemed to be very low in both the stores near me, so had to buy some from one store and some from another.. If you need a few, try and order them ahead of time."