Originally Posted by
LarrySellerz
Has anyone else had a presta valve leak, and think its because you didn't keep the protector on it?
Nope. The plastic cap won't keep air in the tube; they don't seal tight enough, and if the valve is open, the cap will just push down on it and make it leak faster.
The only use I have for a presta cap is as an emergency shraeder adapter. Cut off the tip, turn it upside down, and screw it on. You can then use a shraeder pump or gas station compressor.
https://www.purecycles.com/blogs/bic...hrader-adapter