COMPATIBILITY WITH STANDARD FILTERS AND BOTTLES This 2piece outdoor water filter coupling kit has an inner diameter of 28 mm on both ends, allowing connections to standard 28 mm threaded filters and most plastic water bottles, making it ideal for outdoor hydration needs. LEAK PROOF SEALING Includes two adapters and ten spare washers to provide sealed connections and minimize water waste. The seals maintain strong pressure for a reliable, consistent water supply during long excursions. MULTI FUNCTIONAL USE Connect your water filter easily to a bottle without bulky syringes, or use it with a threaded water bag for hands gravity filtration while camping or traveling. COMPACT AND LIGHTWEIGHT Weighing only a few ounces, these connectors are tailored for backpackers. The compact design enhances portability for hiking and preparedness kits. USE SCENARIOS On the go: attach the filter to a bottle for quick refills during day hikes. Gravity filtration: pair with a threaded water bag for hands filtration at a campsite. Preparedness kit: lightweight, versatile connections for various bottle and filter setups in an emergency kit.