Solder Ring and End Feed - What is the Difference?
Both of these plumbing joints use solder - but what is the difference between the two kinds of fittings?
End feed fittings work on the same principle as solder ring fittings, connecting the pipe and fitting together with a brazed joint. The only difference between these two methods of making joints is that end feed fittings do not have an integral solder ring - the solder is offered into the fitting from a reel when the pipe and fitting are at the correct operating temperature.
Slightly trickier to achieve without practise, end feed fittings are most commonly used by qualified plumbers.