The Enve Pressure Relief Valve Stem Nuts are designed to protect carbon rims in the event of tubeless rim tape failure. It the tubeless seal is broken, air can fill and pressurize the rim's cavity increasing the potential for delamination of the rim's sidewall. The pressure relief nut allows the release of this built up air through specially designed ports. Features: Prevents the build-up of air within the rim via fluted reliefs on the inner diameter of the nut Air escaping from these ports, indicates a compromised tubeless seal Recommended for all tubeless SES wheelsets as well as other brand road tubeless wheelsets Each order includes two nuts, enough for one wheelset