A joint runner is a collar-like device used in cast iron plumbing installations to keep molten lead in place when sealing joints. It is designed to fit tightly around the pipe joint, creating a barrier that allows the lead to be poured into the joint space without spilling or leaking. The joint runner helps create a strong and durable seal, which is essential for maintaining the integrity of cast iron pipe connections, preventing leaks, and ensuring proper flow within the system. Joint runners are typically made of heat-resistant materials and are reusable, making them a valuable tool for plumbers working with traditional cast iron pipe systems.
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