The Hydrolock Non-Spill Cap is designed to reseal securely when removed from a water cooler , ensuring a leak-free, secure enclosure. As a standard feature, the Hydrolock Cap comes equipped with a tamper-proof seal that ensures the product remains uncompromised, preventing any potential tampering or contamination. Additionally, a specially designed inner washer system provides a secure and reliable seal, ensuring a tight and consistent fit on a wide range of water cooler bottles, offering a universal fit and added convenience.