Synopsis

Landscaping contractor Roger Cook and a specialist assist a homeowner in installing a granite marker for his driveway, ensuring visitors can more readily locate his residence. Afterwards, Roger joins plumbing and heating expert Richard Trethewey, general contractor Tom Silva, and host Kevin O'Connor as they ponder the question, "What is it?" Subsequently, Richard travels to Pennsylvania to address a malfunctioning hot water radiator that has ceased to provide warmth.