Detachable valve core is convenient for inflating and adding sealant. Compatible with tubeless rims. Made of high quality aluminum alloy, tear resistant rust and durable. 100% brand new and high quality. Valve group: 1. Make sure the spool is in place. 2. Remove the jam nut and O-ring. 3. Insert the valve stem into the valve hole on the rim. 4. Place the O-ring on the valve stem. 5. Screw the lock nut onto the valve stem. 6. Tighten the lock nut until the rubber end of the valve is firmly seated in the valve hole of the rim. Note: Due to the slight color difference between manual measurement and different display settings, please allow 1-3cm error. The picture is for reference only, the bottom of the actual product is wrapped with rubber black. Product size: total length 4.4 cm Blue color Shipping quantity: 2 pieces