removal of wildcat airtube ???

Hey guys. I know this question was asked before but never answered. Do I have to bleed the air out before removal? I know some fx guns have a check valve to stop the air from escaping but on the exploded drawing of the wildcat I see no check valve where it unscrews. Does anyone have any experience with this?
 
I recieved an email from Johan at Fx letting me know that to remove the air tube on the wildcat the air has to be bled out first as there is no safety valve to contain it. This is good to know if your going to do this. I read on one post here that someone thought it was the same design as the bobcat and that he wouldn't bleed the air from the wildcat first before removal of the air tube. Ouch!!! That would have been a mistake