1. This is a vented cap with a regular thread.
2. Comes with o-rings to prevent leaks.
3. Simply push the center area down and rotate.
4. 90 degree to show or hide the inner cap.
5. Easy to install, simply replaces your existing cap.
Returns / Change of Mind Policy: We 100% support our customers, If you are not satisfied, you may return any item within 30 days of delivery. If the product is no problem, all shipping charges must be paid by customer for returns. If you have any problem with our products, please CONTACT US at once.