Surevalve ™ was originally developed as an extra level of safety for race car drivers.  The basic priciple of the Surevalve ™ is that the valve core sits subriminal in the base valve.  This provides greater protection for the valve core during impact of the valve stem.  Surevalve ™ also incorporates a break-away outer valve stem which is designed to break during valve stem impact without deflating the tire assembly.  These break-away outer stems can also be replaced without removing the tire or the Surevalve™ base valve from the rim.  Due to  Surevalve's ™ many useful applications, it is now being offerred to the public.