These brass tire valve stems are precision-engineered replacements designed specifically for TR218A and TR618A tractor models. Built from heavy-duty brass with integrated CH3 cores, these valve stems deliver exceptional durability that resists corrosion, impacts, and the demanding conditions of agricultural and industrial environments. The premium metal construction significantly outlasts plastic alternatives, ensuring long-term reliability for your farm equipment and trailers. Installation is remarkably simple with a tool-free, plug-and-play design that allows you to replace worn valves in minutes, whether you're working in the field or in your workshop. The meticulously threaded design creates airtight seals for both air and liquid ballast applications, preventing leaks while maintaining optimal tire pressure. This controlled ballast system helps reduce the occurrence of puncture accidents and delivers better traction, resulting in a safer and more comfortable driving experience. The balanced tire pressure also minimizes vibrations and operator fatigue across diverse terrain. This 6-pack set provides excellent value for maintaining multiple pieces of equipment. Please verify your valve number matches TR218A or TR618A before purchasing to ensure proper OEM-compatible fit.