"Had no problems with leaks on these so far and fitted quite a few. You have to be careful to fully insert the pipe and ensure the olive seats correctly as this can lead to crushing rather than sealing."
"After installation by a gas safe approved heating engineer 6 out of 10 radiator valves leaked. The valves were removed, examined and refitted and still leaked - it seems that the machining of the knuckle joint is poor so does not provide a decent seal. I have returned all 10 valves and will be replacing with a reputable branded valve."