2pcs Aluminum Alloy Bicycle Presta Valve Stem Bike Vacuum Valve Stems for Mountain Bikes Road Bike 40mm black

Features: Made of lightweight CNC anodized aluminum. Lightweight, Anti-corrosion, Anti-rust and Solid. With a removable valve cover, O-ring, and lock nut. O-ring contours the rim surface for an air-tight seal, ensuring that the nut can be tightened and protecting the rim. The presta valve stems have removable valve cores for ease of use, and the removable valve core can be applied for easy inflation and addition of sealant. It is suitable for most of wheel models and other tubeless rims, etc., the presta valves with base are suitable for installing on different rims. They are quick to set up, providing a good seal for you to change your sealant or rims frequently, you can get back to the trails faster. Specifications: Material: Aluminum al