Secure, lockable closure Robust latch mechanism blocks unauthorized or accidental access to the tank. Double protection prevents contamination and unintended opening, keeping the water reservoir hygienic. Flow-optimized inlet Precision-formed inlet with an integrated channel guide ensures fast, splash-protected water intake. Reduces cleaning effort and simplifies everyday refilling during motorhome use. Temperature compensation for long-term reliability Specially developed material behavior automatically compensates for thermal expansion and contraction. Prevents stress cracks and preserves the sealing function across temperature changes. Enhanced safety and simple operation Dual-key concept adds practical protection against tampering while remaining easy to use. Designed for dependable, user-friendly operation in motorhome water systems. Key attributes Function: secure locking, splash-protected filling, temperature-stable sealing. Compatibility: designed for use with motorhome water systems and freshwater reservoirs. Material: engineered material behavior provides thermal compensation and durable sealing. Performance: fast fill, reduced maintenance, reliable long-term leak protection. Practical use scenarios 1) Campsite refills: Fast, splash-protected filling at a campsite tap while preventing dirt or insects from entering the tank. 2) Seasonal and temperature changes: Maintains seal integrity during hot days or cold nights thanks to automatic compensation for thermal expansion. 3) On-the-road security: Keeps the water reservoir closed and clean during travel, while the dual-key system prevents accidental opening or unauthorized access. What this delivers Cleaner water, less maintenance, and reliable sealing in daily motorhome operation. A practical, durable component that balances security and ease of use without adding complexity.