Removable tire valve stems 4-pack for wheel hubs this 4-pack of high-quality valve stems is designed for direct installation into the wheel hubs of your cunfon rz800 or rz1000 electric scooter. They are the removable type that secures to the rim, not the fixed stems attached to inner tubes. Complete set for both wheels the set includes four 4 valve stems, providing a full replacement for both the front and rear wheels of your scooter. Wheel hub installation specifically designed to be installed into the wheel hub's valve hole. They create a secure, airtight seal directly at the rim, which is crucial for maintaining proper tire pressure in tubeless or specific tubed setups. Durable & reliable made from durable materials with a brass core to resist corrosion and ensure a reliable seal. The removable design allows for easy replacement if damaged. Easy installation & maintenance designed for straightforward installation with common tools. Replacing old, leaky, or damaged valve stems is a simple maintenance task that can improve tire pressure retention. Compatibility note designed specifically for cunfon rz800 and rz1000 electric scooter wheel hubs. Please verify the valve hole size on your scooter's rims before purchase.