Cushcore tubeless air valves are specially designed to work with a cushcore insert. The air passageway is T-shaped, rather than a simple through-hole, which prevents the insert from obstructing air flow through the valve. CushCore Tubeless Air Valves Features The valve body is CNC machined from 6061 t-6 aluminum, Anodized black Tapered rubber collar permanently bonded at the sealing interface. The valve core can be removed to add tire sealant. A locknut with o-ring seal and valve cap are included.