"I have purchased about 10 of these 22 mm isolating valves, yes they do isolate and don't leak- initially. So it was left open to flow for 8 or 9 months. On needing to emergency turn off a section of heating pipes, the 2 valves controlling feed and return of the area were a) stiff to turn off, and b) leaked through the screw area, one leaked 200 ml in an hour, the other about 100 ml in an hour. This was when used to stop flow, and unfortunately when turned open to re-allow flow, BOTH CONTINUED TO LEAK! One surely expects to not need to use them very frequently once fitted, and when you do need to use them, they should work effectively, well yes they isolated the section of piping, BUT they themselves leaked. removal of them was more of a problem than the situation that caused them to be used to isolate the area! I thought they were good, now I am not so sure, and it will be with apprehension when I need to use the others to isolate a section of piping! Good Luck to those who fit them and require to use them in the future! I rarely comment on materials, but replacing them has been a real WET PIG! Cheers Stan"
"does not do the job. Bought as a pair one would not turn off properly and continued to let water by. The other would not compress properly. Changed the olive changed the pipe put a wrap of tape on the third olive and it still leaked."