1. FOR KARCHER COMPATIBILITY: This safety lock with black Oring 4.590105.0 is specifically designed for several Karcher steam cleaner models including SC1.010, SC1.020, SC1.030, SC2.000, SC3.000 and many more, providing a precise fit that helps maintain the performance of your steam cleaning.<br> 2. ENHANCED SAFETY FEATURES: With a quality safety valve combined with a sturdy black Oring 6.363279.0, this replacement part creates a reliable seal that effectively reduces the risk of leaks and allows safe operation throughout your cleaning session.<br> 3. CONSTRUCTION: Made of quality materials, this safety lock is built to withstand temperature steam cleanings and regular use, providing longlasting reliability without compromising performance even after extended cleaning tasks.<br> 4. EASY REPLACEMENT PROCESS: Thoughtful design allows for quick and straightforward installation with no special tools—simply remove the old cap and attach this replacement part to get back to your cleaning routine in minutes.