Washington Copper Tubing Gas Line Pre-instruction Checklist is a set of procedures to ensure the safety and proper functioning of a gas line installation. This checklist is used to identify potential hazards and flaws before the installation process begins. The checklist includes a number of steps, such as: 1. Inspect existing gas lines for any signs of wear and tear. 2. Check for evidence of corrosion, rust, or other damage. 3. Verify that all gas lines are properly sized and rated for the job. 4. Test all gas lines for leaks using a gas leak detector. 5. Ensure that all necessary safety equipment is in place. 6. Inspect the area for any potential hazards, such as combustible materials or flammable gases. 7. Verify that all valves, fittings, and connectors are in good working order. There are two types of Washington Copper Tubing Gas Line Pre-instruction Checklist: one for new installations and one for existing installations. The new installation checklist focuses on testing for leaks and verifying the sizing and rating of the gas lines, while the existing installation checklist focuses on identifying signs of wear and tear, corrosion, and other damage.