Washington Steel or Wrought-Iron Gas Line Pre-instruction Checklist is a comprehensive list of items that should be inspected prior to the installation of a gas line. This checklist typically includes items such as the gas line route, proper line sizing, connection points, and leak test procedures. It also includes the inspection of all necessary tools and materials needed for the installation. Different types of Washington Steel or Wrought-Iron Gas Line Pre-instruction Checklist include a Pre-Installation Checklist, a Post-Installation Checklist, and an Annual Maintenance Checklist. All checklists should be completed prior to the installation of any gas line in order to ensure the safety of the structure and the people who inhabit it.