I really do not know our factory will be used so many Control Valve, and is the first time I see the Control Valve Control Valve, always listen to say, but I have never seen before, we found the Control Valve is not the same, then I ask how this is a master like Control Valve, the master told me that, because we use the Control Valve quality must be the best, but also more durable, so we use the Control Valve seems to be stronger, this is our Control Valve factory specializes in making, heard master say this, I also understand the Control Valve is not the same.