Caiman X valve

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I just watched a video of the X being taken apart. It was in Arabic I believe so I couldn’t understand it. But there was a piece inside the valve body, it looked like a piece of clear plastic. I was wondering what it was for. The only thing I could think of is to take up plenum volume, but if that’s the cause why would they want to take up plenum volume?? Anyone taken their X apart or know what that piece is for?? 
 
View attachment 170035I just watched a video of the X being taken apart. It was in Arabic I believe so I couldn’t understand it. But there was a piece inside the valve body, it looked like a piece of clear plastic. I was wondering what it was for. The only thing I could think of is to take up plenum volume, but if that’s the cause why would they want to take up plenum volume?? Anyone taken their X apart or know what that piece is for??
hi, may I get the link for this video? thank you