Industry Nine Tubeless Valves - 40mm Silver PairIndustry Nine Tubeless Valves 40mm Silver Pair. Tubeless Valves feature a removable valve core for ease of sealant install inflation or accommodation of valve extension courtesy of standard type extenders. They have both an o ring and a threaded washer to keep the rim scratch free and to keep the washer tight. A clog resistance function is achieved by 1) oversizing the valve bore near the internal rim rubber seal and 2) the machined extension of the