Earning a diploma in Plumbing can prepare students to learn the basic skills involved in the trade as well as the codes and regulations that govern the plumbing trade. Courses cover installation procedures, how to read and follow blueprints, when to use PVC, iron, steel, or copper tubing, and valves and joint fittings. Instruction also includes maintenance and repair of water heaters, spas and pools, and air conditioning systems as well as waste disposal and drainage considerations. The final lesson demonstrates opportunities that are available to graduates and the business aspects that affect plumbers in bids and contracts with customers.