The pipe was standard 3/16 brake pipe Paul, cupro/nickel from any motor factors. The unions the same. The ends needed to be mushroomed for the unions I'd bought. The old steel pipe was a bit harder than the cupro/nickel to mushroom but still not difficult. The cause of the leak was corrosion where a bracket that should have held the pipe wasn't seated properly. Between that and the moisture it's sign through. Unfortunately looking at my log book the car was used for its first 7 years at s coastal town, think the salt water has added to the corrosion. The tow bar is in a bad state too.