Zipp Disc Valve Adapter

- Synthetic elastomer gasket with 2X the holding power and 5X wear resistance of traditional gasket materials - 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 pump hose - 12.0g