Tom shows Kevin what's inside a typical residential electrical service panel. Then, master electrician Allen Gallant helps homeowner Steve Bankowitz of Burlington, Massachusetts install a 220-volt receptacle in his garage-turned-woodshop. Roger shows Kevin what types of hand tools every home gardener should own. Then, the crew ask, "Whats Is It?" in the Ask This Old House loft. Later, Richard helps homeowner Scott Jones of Arlington, Massachusetts install a macerating toilet in his basement.