"I used a pair of these valves to plumb in a booster pump for my hot water system. They seal so well that I have been able to use them to isolate the hot system instead of relying on the old gate valve, which these days would let a double decker bus through.
Most important:The full bore design does not hinder the water flow too and from the pump, which is essential.
# Quality is excellent.
# Fitting is a piece of cake.
# I can't comment on the reliability, they have only been installed a month, but I think they should be very reliable give the build quality."
"Although more expensive than normal isolating valves these are well worth using so as not to reduce the pipe diameter on long runs or where multiple appliances are connected. Particularly useful for isolating larger central heating systems into zones so as to avoid draining whole system down."
"Fitted quite a few of these, no problems (yet !). Full bore means no restrictions being added, at this point, to the pipework, never mind what other changes to ID occur elsewhere. Like all 22mm compression, better/easier/more reliable to seal with loctite 55 than PTFE. But maybe I've limp wrists."
"Worked fine for 15 months but then had to use for the first time to isolate the hot and cold supply to a bathroom. As soon as the screw was turned they both started leaking through the screw hole. Had to drain down the entire system so they were were useless for the task for which they were bought. Given that other reviewers have reported similar problems Screwfix should stop selling. Have replaced with WRAS and British Gas approved full bore lever valves. Would have got top marks for value had they worked, but it's cost me a lot to replace them so they were a false economy."
"Installed one during renovation project. Ball seized after several months, tried soaking in penetration / lube oil - no good. Would not buy 22mm version again. Would not budge. Rubbish (15mm version installed alongside ok) - will try 22mm lever option instead"
"Fitted this valve, the ball siezed and would not turn in either direction, ended by being stabbed in the hand with the screwdriver...not pleased and very painfull. Will never buy one of these from Screwfix again."
"installed two without checking they turned first (my bad!) one just about turned the other stuck fast - de installed and took back and spent 1/2 hour with the staff going through all their stock - not a single one turned..........
"Read the reviews but bought it anyway. Thought it couldn't be that bad....but it was! Fitted it no problems but had to isolate taps later but isolater screw just wouldn't turn. Totally useless piece of kit! Screwfix refunded no probs but really they should not be selling them as they cause a lot of grief when called upon to isolate."
"It does not isolate. Fitted 2 for isolating hot and cold pipes during bath replacement. Both leaked water through shut-off valve and flooded my floor. Screwfix did give me a refund though, so great service."
"I have had a few if these fail on me. After being installed for a couple of years, one I had on a towel radiator was weeping. When I tried to shut it off the leak got worse and several others I needed to close would not shut off fully - the screw would not turn the last 10 degrees. It is a shame as I like the hex on the body and the large bore."