Universal Negative Dedicated Compatibility: Ensures a precise fit on standard 12V negative top-mounted battery terminals, especially those with a 7cm diameter pole head, for secure and stable electrical isolation.;Power Master Quick Disconnect: Enables rapid power cut-off to prevent battery drain, support maintenance work, or enhance vehicle safety – simply loosen the green knob to isolate the system.;Leak-Proof & Knob Model: The sealed brass casing prevents moisture ingress, while the intuitive knob design allows for tool-free operation, enhancing accessibility and reducing terminal wear over time.;Durable High-Quality Material: Crafted from quality brass using die-casting for maximum strength and longevity, resisting corrosion and high-current loads in demanding environments.;Wide Application Flexibility: Ideal for use in cars, boats, trucks, RVs, and tractors, offering a reliable disconnect solution for both everyday drivers and off-grid enthusiasts.;This universal negative dedicated battery switch combines professional engineering with practical functionality to deliver superior power management for 12V systems. Made from quality brass using advanced die-casting techniques, it offers excellent durability and resistance to environmental factors. The leak-proof knob model allows for quick and secure disconnection – simply turn the green knob to cut off power, preventing unwanted discharge and enhancing safety. Specifically designed for negative top-mounted batteries with a 7cm pole head, it ensures a tight and stable fit across a wide range of vehicles. Whether you're protecting a boat during winter, securing a classic car, or maintaining an RV, this Cut Off Isolator Switch provides a reliable and long-lasting solution for effective battery control and system protection. r nOur customer service team consists of experienced, professional, and responsible staff. They will do their utmost to solve your problems and convey our sincerity and commitment. By choosing our products, you choose safety and peace of mind.