now denny I don't want to get into one of your vendettas with you but that check valve has nothing to do with operation of the booster the valve that is in question is the valve inside the booster that is moved by the application rod hooked to the brake pedal that is commonly refered to as spool valve some real early units used a poppet type valve but any rate the booster has to be disassembled to git to it and I don't think he is interested in doing that on a new unit I know I wouldn't be .....ted