The "Lufty 2" is a completely revised valve, the new valve has the following innovations: 1. New aluminum from aviation. 2. Valve head even lower and there are 2 air slots. 3. The valve head at the bottom has a groove where the valve rubber is supported. 4. Valve stem has been reinforced. 5. Valve cap is now made of aluminum and extended to provide more protection. 6. Valve cap and valve head have the PTN logo.