I have many of these used on a ro unit all NC I have on NO but changed used case for that one.I have one that connects to the out put of the RO unit This is typically at around 50PSI and is used to flush the ro system.I have one connected to the water feed line this is around 60psi this is used to flush the feed so the system can be depresurized and drained.I have one connected to the RO stroage tank this one is at beween 30-55psi depending on volume in the tank. I use this one to drain the tank.I lastly have one used as by pass on the waste outflow restrictor to flush the ro membraine.Thus far 6months, no leaks BUT I DON'T engergize often and when I do never longer than 60 seconds most often in the order of milli seconds.I typically once every 3 months I perform a flush of the the ro system, drain tank, flush memrane, then flush all tubing. This take no longer than 60 seconds max.I had ZERO faith and still have ZERO faith using this for critical flow, I used full motorized ball valved to control the main water line shutoff, and I also for the tank flow. Mainly because I want to be able to in emergance or service leave the feed shut off indefinatly and this wouldn't be safe with these.