Muc-Off Kit Tubeless Valves / Big Bore Lite Xlarge - BlackFeatures Featuring a cutting edge, integrated ball valve system, the valve ensures lightning fast airflow, turbocharging the sealant filling process. Say goodbye to the hassle of traditional tubeless valves that clog up and require the valve core to be removed to fill sealant and achieve sufficient air flow during tubeless set up. Our Big Bore Lite offers up to 230% higher air flow than traditional Presta valves thanks to the straight through bore