New, synthetic elastomer gasket with 2X the holding power and 5X wear resistance of traditional gasket materials. The New, two-stage seal design improves sealing and stability on all Presta valve stems. Adjustable compression, user can tighten the cap to increase holding power by 4X and compensate for wear. 15-degree stem angle reduces stress on the valve stem from the pump hose

Features

• New synthetic elastomer gasket
• Two-stage sealing construction
• Adjustable compression
• 15 degrees stem angle