This Dunlop (DV / Woods) bicycle inner tube valve replacement set (2 pieces) is an essential maintenance accessory designed to restore complete airtightness to leaking bicycle tires. Over time, worn or corroded valve cores often become the primary cause of slow air leaks, and replacing the core mechanism provides an instant fix without having to discard or patch the entire tube. The set includes two precision-machined brass Dunlop valve cores with durable seals, retaining screw collars, and protective dust caps. Requiring no special tools for installation, they thread in smoothly by hand and deliver a dependable, airtight seal for all standard commuter, city, and children's bicycle tubes fitted with classic Dunlop valves.