Since 1979, VULKAN Lokring has developed, manufactured and marketed mechanical tube joining systems for refrigerant lines. As a developer of the LOKRING technology, VULKAN Lokring is a market leader in the field of solder-free and non-detachable tube joints. Developed originally for the most extreme conditions encountered in manned space travel, the LOKRING tube joining technique has undergone constant advanced development for applications in commercial refrigeration and air conditioning technology. more info on www.vulkan.com/en-us/lokring