Sometimes the rubber ring on your bottle will become worn-out. If you have a bottle purchased BEFORE July 2013, then you will either want to purchase a replacement gasket or get our new logo cap. These replacement gaskets are actually made from SILICONE. All NEW bottles on our site come with our custom Logo Cap already, which has a built in, non-removable gasket in light blue. If you have a RED gasket in rubber or silicone on your cap now and you want to replace just the gasket, then this is what you want to buy.
If you have a bottle with our new logo cap, you will not be able to use these red gaskets with it .