1. SAFETY MECHANISM: This steam cleaner filling cap features a pressure relief system that automatically releases steam when boiler pressure exceeds safe levels, forestalling potential hazards during operation. The dual functionality design serves as both a relief valve and protective shutter for your steam cleaning equipment, maintaining internal pressure levels for effective cleaning performance. 2. COMPATIBLE WITH MULTIPLE MODELS: Specifically designed to fit various models including for SC 2.500, for SC 2.600, for SC 4, for SC 5, for SC 5.800, for SC 6.800, SC2500C, SC4.100, and SC5.800C. This maintenance valve ensures seamless integration with your existing steam cleaning setup without any modifications needed. 3. EASY INSTALLATION AND MAINTENANCE: The closure is engineered for straightforward installation in both steam cleaners and ironing stations, allowing for quick maintenance with minimal downtime. Simply your old cap with this one for immediate restoration of your steam cleaner's functionality. 4. QUALITY CONSTRUCTION: Crafted from robust materials with a black finish, this maintenance valve is built to withstand the temperatures and pressures of regular steam cleaning operations. The LONG LASTING design maintains consistent performance throughout extended cleaning sessions and frequent use.