Features: Portable and rust proof 50mm bike stopcock stems consist of‌ anodized aluminum ensures durability while providing an hermetically seal on wheels with stopcock holes up to 8mm diameter. Features removable stopcock cores with spare caps, integrated O rings, locking fasteners, and soft rubber bases for secure installation and convenient sealant refills in bicycles maintenance. Ideal for cyclists seeking reliability stopcock extenders for mountain bikes, road bikes, or mixture cycles requiring extended reach to inner tubes. Perfect for maintaining optimal tire pressure during long distance rides, city commutes, or competitive cycling event where hermetically performances matters. Engineered with accuracy machined aluminum bicycles stopcock, this pair combines erosion resistance with user friendly design for effortless compatibility with stopcock systems. Specifications: Product name: valveless cores removal vacuum air nozzle component: Aluminum alloy Length: 50mm type: Reference picture Package Includes: Valveless cores removal vacuum air nozzle note: Please allow 1-2cm errors due to manual measurement