Washington Alteration Polyethylene Re-Pipe Pre-instruction Checklist is a comprehensive list of items used to inspect an existing plumbing system prior to a re-pipe job. This checklist is used to identify any existing damage, determine the condition of the plumbing system, and ensure all components are up to safety and code requirements. The checklist includes items such as: visual inspection of the existing piping system, testing for water pressure and flow, checking water heaters and other fixtures, inspection of all valves and regulators, and testing for cross-connection and backflow. Different types of Washington Alteration Polyethylene Re-Pipe Pre-instruction Checklist may include residential, commercial, and industrial versions.