Feature:1. Rust Resistant: Made of lightweight anodized aluminum, our tubeless french stem is not only lightweight but also rust resistant. Stem length 60mm.2. Hermetic Sealed: This vacuum nozzle has a detachable bonnet, O shaped and lock nut, and a soft rubber base easily creates a hermetic sealed on the valve hole.3. Durable: This mountain bike vacuum nozzle is made of premium aluminum alloy, which is durable and not easy to damage.4. Removable Valve Core: The valve core is a removable cover, which can help you remove the core and easily fill the sealant, easy to use.5. Universal Design: This vacuum extension valve fits most mountain bikes and road bikes, there will be no mismatch problems, you can buy with confidence.Specification:Item Type: Presta Valve StemMaterial: Aluminum AlloyGross Weight: 7g / 0.2ozProduct Size: Approx.60 x 10mm / 2.4 x 0.4in Package List:1 x Presta Valve Stem