Universal Fit and Versatile Use: Designed to fit any 28mm external threaded water filters and standard plastic bottles, this coupling kit is perfect for direct drinking, efficient backwashing, or setting up a -based filtration system during outdoor adventures. Enhanced Sealing with Spare Gaskets: Equipped with 10 additional gaskets, these water filter adapters a tight fit and superior sealing, preventing any leakage and enhancing filtration efficiency. Ideal for extended outdoor activities, providing reliability even in rugged conditions. Streamlined and Portable Design: Our water filter coupling is an excellent alternative to bulky syringes, making it perfect for long hikes, camping, or emergency situations. Its compact size ensures it fits easily in your pack without adding extra weight. Easy Setup for Efficient Water Filtration: Simply attach the water filtration connector with its gasket to your water filter, screw the other end onto a 28mm threaded plastic water bottle, and firmly to backwash the filter. This easy-to-use system ensures you have access to clean water quickly. Multipurpose Functionality: Not only can you use this coupling to backwash filters using a clean water bottle, but it also works seamlessly with a threaded water bag to create a filtration system, freeing up your hands and providing ample clean water effortlessly. Color:Blue & White Material:Plastic+Silicone Package Contents: 2 * Water Filter Coupling 10 * Gasket Seals Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.